Leodicidce from Fiji and Samoa. 147 



the greater part of the dorsal surface of the prostomium (plate 4, fig. 1). The median 

 tentacle is over 5 times as long as the peristomium, the inner paired more than half as 

 long as the median, the outer paired about as long as the peristomium, all very thick 

 and heavy. In the preserved material no tentacle shows any color. The eyes are 

 prominent. 



The lateral margins of the peristomium are nearly straight and parallel to one 

 another, with the anterior lip on either side much in evidence. The peristomial 

 length is about one-third less than its width and longer than the combined length of 

 somites 2 and 3. In life the constriction between the anterior 3 somites is not very 

 sharply defined and somite boundaries are further obscured by the dorsal mottling 

 with pigment. The nuchal cirri are not quite as long as the peristomium. 



Throughout the anterior region the dorsal cirri are especially prominent, being both 

 long and thick. Behind the region of somite 20 they are more slender, but remain long, 

 and in the gill region they become successively smaller beyond the region of somite 

 50. In the posterior portions they are shorter than the gills and are sharp-pointed. 



As is common in this genus, the first parapodium has a small setal lobe \\ath large 

 cirri, though these latter are relatively smaller in L. crassi-tentacidata than in most 

 species. The tenth parapodium (plate 4, fig. 2), has a prominent setal lobe with 

 dense tufts of simple and compound setse. The anterior lip is vertical, with a dorsal 

 protrusion; the posterior lip is rounded. The apex of the setal portion has a ventro- 

 anterior and a dorso-posterior rounded swelling. The compound setae arise between 

 the anterior lip and the former of these swellings, while the simple setae arise between 

 the latter and the posterior hp. Three heavy aciculae reach the surface between the 

 two swellings. The dorsal cirrus is long and symmetrically narrowed toward the 

 apex, the ventral cirrus short and thick on a rounded swelling. A tuft of needle 

 aciculae extends into the base of the dorsal cirrus. The fiftieth parapodium (plate 4, 

 fig. 3) is much smaller than the tenth, and has fewer setae. There is one dorsal and 

 one ventral acicula, the latter hooked at the apex. The figure shows the rounded 

 post-setal lobe, the anterior one being vertical. The dorsal cirrus is slender and sharp- 

 pointed, larger than the base of the gill which arises from the basal portion of the 

 cirrus. At some distance from its point of origin the gill divides into two nearly equal 

 branches. There is a tuft of needle aciculae in the dorsal cirrus. The ventral cirrus is 

 conical, on the end of a rounded swelling. Parapodia from the posterior end of the 

 specimen in general outline and setal components are not noticeably different from the 

 fiftieth, but the gill is 1-branched. 



The simple setae are of varying lengths, but in the tuft they are arranged so that 

 the longest lie at the dorsal part of the tuft. Apart from length differences, they are 

 all alilce, each (text-fig. 30) curved and tapering to a sharp point at the apex with a 

 wing along the concave and convex edges. The compound setae (text-fig. 31) have 

 their basal portions with no denticulations along the terminal edge, the terminal joints 

 with terminal and subterminal teeth covered by a hood with smooth margin. The 

 pectinate setae are very few in number, even in the posterior somites where the number 

 in other species frequently exceeds the number of the other kinds. Each pectinate 

 seta is very slender and delicate, with about 20 terminal teeth, but these were very 

 difficult to demonstrate. 



The aciculae from somite 50 are very black (except for their extreme tips), the 

 dorsal ones with bluntly rounded tip (text-fig. 32), the ventral ones with 2 teeth, of 

 which the ventralmost is slightly the larger (text-fig. 33). 



The maxilla (plate 4, fig. 4), is dark-colored, especially at the ends of the forceps 

 and the plates. The carrier is small, each half rounded on the margin; the forceps 

 heavy relative to the carrier. The proximal paired plates have 4 teeth on the left and 

 5 on the right, the distal paired have 8 on the right and 5 on the left, the unpaired 

 has 7. Dark pigment-patches lie just bej'^ond the distal plates and a very thin plate 

 with one corner bent lies on either side of them. The mandible (plate 4, fig. 5) was 



