36 



BIOLOGICAL RESULTS OF L^^ST CRUISE OF CARNEGIE 



Genus VANADIS Claperede 



Vanadis formosa Claperede 



Vanadis formosa Claperede, 1869, pp. 480-482, pi. 10, 



fig. 3. 

 Vanadis formosa Chamber lin, 1919, pp. 134-135. 



Chamberlin gives a long list of localities from which 

 this species was taken on the expeditions of the Albatross, 

 and concludes that it is identical with V. fusca punctata 

 Treadwell (see below). The two species are quite unlike, 

 however, V. formosa being much larger and stouter in 

 every way. In V. formosa the body has a very thin wall 

 whereas in V. fusca punctata this is relatively heavy. 



Stations and depths of collection are as follows: 



Sta- 

 tion 



Sur- 

 face 



50 m 



100 m 



Sta- 

 tion 



Sur- 

 face 



50 m 



100 m 



Vanadis fusca punctata Treadwell 



Vanadis fusca punctata Treadwell, 1906, pp. 1159-1160, 



figs. 29-31. 

 Vanadis minuta Treadwell, 1906, pp. 1158-1159, figs. 25- 



28. 



In the above mentioned paper the author has listed 

 these as distinct species. Having had access in the Car- 

 negie material to a much larger number of individuals, 

 he has discovered that they really are the same species. 



Stations and depth of collections were as follows: 



Sta- 

 tion 



Sur- 

 face 



50m 



100 m 



Sta- 

 tion 



Sur- 

 face 



50 m 



100 m 



87 

 88 

 89 



157 

 158 

 160 



(See map 3, p. 58). 



Vanadis uncinata n. sp. 

 (Plate II, figures 23, 24) 



Three pieces apparently together compose an entire 

 individual. The anterior fragment contains about forty- 

 five somites and is 20 mm long, the second has twenty - 

 three somites and is 15 mm long, whereas the third, 

 which is 12 mm long, has about twenty somites and a 

 narrow terminal part. Apstein (1900, p. 10, pi. 1, fig. 1) 

 describes and figures a similar, much more slender 

 prolongation on V. formosa, which he says does not al- 

 ways appear. In V. uncinata this shows faint traces of 

 metamerism and the anal opening is at its posterior end. 

 It is evidently a regenerating pygidium. 



The eyes (pi. 11, fig. 23) are not particularly promi- 

 nent, the total width across the two being 1.5 mm. In 

 this specimen, in which the proboscis is protruded, and 

 hence it is possible that there has been more or less 

 distortion, the eyes are widely separated and the pro- 

 stomial surface between them depressed. The tentacles 

 are conical in form, the median one situated at about the 

 level of the middle of the eye. The proboscis is relative- 

 ly short and stout, its two terminal branches ending in 

 sharply recurved pointed hooks. Dorsally, the membrane 

 uniting the bases of these hooks carries about nine mar- 

 ginal lobes, the ventral one never having more than five. 



There are three pairs of tentacular cirri of which 

 the first is the largest. The peristomial width is about 

 equal to the distance between the eyes and the following 

 somites, as far as the seventh, are successively nar- 

 rower. This width increases in later somites until by 

 the fifteenth the diameter is twice that of the seventh. 

 The anterior parapodia are hardly as long as the first 

 tentacular cirrus and their cirri are small. Beginning 

 in the region of the eighth to the tenth they increase in 

 size as the body widens, but never become large as com- 

 pared with the body width. In a fully developed parapo- 

 dium (pi. II, fig. 24) the setal lobe is sharp-pointed and 

 has a single acicula whose tip projects beyond the apex 

 of the setal lobe. A slender cirrus, characteristic of 

 the genus, is attached to the end of the setal lobe poste- 

 rior to the acicula tip. In each parapodium there is a 

 bunch of very long and slender compound setae. A round- 

 ed, brown-colored setal gland lies on the dorsal surface 

 just posterior to the parapodium. The appearance of this 

 varies in different individuals. 



The type is no. 20086 in the United States National 

 Museum and was collected in 50 m at station 47. See 

 map 3 (p. 58). 



Genus MAUITA Chamberlin 



A fragment of a species belonging to this genus was 

 taken in 50 m at station 47. 



Genus RHYNCHONERELLA A. Costa 



Rhynchonerella pycnocera Chamberlin 



Rhynchonerella pycnocera Chamberlin, 1919, pp. 147-150, 

 pi. 25, figs. 7, 8; pi. 29, figs. 1-6. 



