40 



BIOLOGICAL RESULTS OF LAST CRUISE OF CARNEGIE 



Sta- 

 tion 



Sur- 

 face 



50m 



100 m 



Sta- 

 tion 



Sur- 

 face 



50m 



100 m 



FAMILY SYLLIDAE 



Genus AUTOLYTUS Grube 



Autolytus pacificus n. sp. 



(Plate II, figures 28-30) 



Only female individuals were present and of these 

 one was carrying a prominent bunch of eggs attached to 

 the ventral surface, as is common in this genus. The 

 body of the type ic about 3 mm long and somewhat less 

 than 0.4 mm wide. It is divided into three regions: the 

 anterior, the median, and the terminal region. The most 

 anterior region is composed of a head and five setiger- 

 ous somites in which there are no evident parapodia, the 

 setae arising directly from the body wall. The median 

 region is composed of twelve somites which carrv prom- 

 inent parapodia. The terminal region is shorter than 

 the anterior one, and it is not possible, owing to the 

 conditions of the material, to determine the precise so- 

 mite number. There seems to be about eight (pi. II, fig. 

 28). 



Seen from the dorsal surface the prostomium (pi. II, 

 fig. 29) shows a median and two lateral rounded lobes, 

 and two pairs of eyes of which the ventral ones are much 

 the larger. These sometimes lie in such a position that 

 the smaller one is seen on top the larger (fig. 29). 

 There are no tentacles unless small rounded lobes ven- 

 tral to the eye may represent these organs. 



In the anterior region four or five setae arise di- 

 rectly from the body wall on either side of each somite. 

 These (pi. II, fig. 30) are slender and short, and are bi- 

 furcated at their ends. In none of these somites is there 

 any trace of compound setae. In the median region each 

 parapodium carries a tuft of setae similar to these but 

 having longer stalks and in addition some very long, 

 slender, sharp-pointed ones. 



The type is no. 20089 in the United States National 

 Museum and was collected at Samoa on the surface. 



The author admits that he is entirely uncertain of 

 the systematic position of the annelids now to be de- 

 scribed and has given them new generic and specific 

 names. If they really belong in some well-known genus, 



that fact will doubtless appear later. Tentatively they 

 are grouped with the Syllidae. 



EPITOKA n. genus 



Palps completely fused, forming a prostomial mar- 

 gin ventral to the bases of the dorsal tentacles. There 

 are two pairs of tentacles, two eyes, and one pair of ten- 

 tacular cirri. The apices of all parapodia are drawn out 

 into slender processes much longer than the body width. 

 Setae begin on the second somite, and are long, slender, 

 and compound. Dorsal and ventral cirri are short and 

 ovate with acute apices. 



Epitoka pelagica n. sp. 

 (Plate II, figure 31) 



The body is very slender and transparent, npt more 

 than 3 mm long, prostomial width 0.17 mm. The pro- 

 stomial breadth is about twice its length, and it is mod- 

 erately incised on the anterior margin, each side being 

 prolonged into an anterior tentacle. Ventrally a rounded 

 lobe (fused palps?) extends in front of the prostomium. 

 The ventral tentacles are somewhat heavier than the 

 dorsal ones (pi. II, fig. 31). On the prostomium are two 

 large eyes with their lenses directed outward. The first 

 somite is short and definitely marked off from the pro- 

 stomium. It carries a pair of tentacular cirri which 

 much resemble the tentacles in appearance. On the sec- 

 ond somite are parapodia, which, at a distance from the 

 body about equal to the diameter of the latter, decidedly 

 narrow and are carried beyond this point to a distance of 

 five or six times the body diameter. The type was some- 

 what macerated so the exact outline of this parapodial 

 prolongation was difficult to determine, but apparently 

 it widens toward the outer end, thus being club-shaped. 

 A small and inconspicuous dorsal cirrus lies near the 

 parapodial base. The ventral cirrus, similarly located, 

 is somewhat larger than the dorsal. The parapodial pro- 

 longation of the second setigerous somite is hardly more 

 than one half as long as that of the first, and the whole 

 parapodium is smaller than the first. In all, there are 

 sixteen somites and this parapodial arrangement holds 

 throughout, there being only a very slight narrowing to- 

 ward the posterior end. There is one pair of long anal 

 cirri, similar in form to the parapodial prolongations. 

 A muscular pharynx lies wholly in somite 3 (second se- 

 tigerous). Scattered through the coelom and in the para- 

 podial cavities of the type were numerous eggs in cleav- 

 age stages. 



In each setigerous somite there are very long setae, 

 which, in some cases, extend beyond the ends of the 

 parapodial prolongations. They are all compound (pi. II, 

 fig. 32); the basal joint broad and flattened, the terminal 

 joint slender and needle-like. 



Because of poor preservation it is probable that the 

 drawing (fig. 31) is incorrect in some details, such as 

 the relative diameters in different parts of the parapodi- 

 al expansions, etc., but the proportions are as accurate 

 as they could be made with the material at the author's 

 disposal. 



The type is no. 20091 in the United States National 

 Museum and was collected at station 62 in 50 m. Others 

 were collected at stations 60, 74, and 96 in 50 m, and at 

 station 73 in 100 m. 



