492 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.45. 



tliin, musculature sparse, but the longitudinal fibers assembled into 

 distinct though small and widely separated strands none of these ex- 

 tending farther back than the visceral mass ; circular fibers very few 

 and restricted almost entirely to the siphons. Length of body 4 cm., 

 of peduncle 6 cm., diameter of peduncle in smallest part about 5 mm. 



Respiratory system. — Tentacles disposed in a wide single circle 

 (fig. 34 h. t), the individuals simple, long and slender all nearly equally 

 long and thick, about 100. Hypophysis very small, elliptical, long 

 and narrow (fig. 36). Branchial sac capacious but the elements 

 all very slender and fragile; internal longitudinal vessels present, 

 numerous, very small (fig. 33, i. I. v.), borne at the summits of long 

 tliin posts, this making this system of vessels rather widely and 

 loosely connected with the brancliial membrane proper; transverse 

 vessels {t. v.) in the form of narrow irregular strands between the 

 serie of stigmata; stigmata very large and long, the prevailing 

 direction of the long axes being lengthwise of the sac, but in places at 

 right angles to this and in some areas the quadrangular arrangement 

 of the vascular net- work characteristic of the genus may be seen (figs. 

 33 and 35.) Dorsal languets (fig. 35, d. lu.) long and slender in keeping 

 with the other elements of the respiratory apparatus. 



Alimentary system. — A rather small compact mass, situated far 

 back and dorsalwards but apparently more to the left (specimen out 

 of shape to such an extent as to make certainty impossible) ; intestinal 

 loop narrow elongate, but simple (fig. 32) ; stomach, st., not very dis- 

 tinct from intestine, with 25 or 30 indistinct folds on inner surface; 

 anal rim smooth. 



Reproductive system,. — Ovary, one only, elliptical, rather compact, 

 situated in the intestinal loop; testes diffuse, scattered over the 

 ovary, in part, and extending on to the gastric hmb of the intestinal 

 loop (fig. 32, ov. and tes.) 



Although clearly belonging to the genus Corynascidia, the species 

 now described and named for Professor Herdman, the founder of the 

 genus, is sharply distinguished from the other two species heretofore 

 described. 



The most unique feature about the animal is the branchial orifice. 

 In its wide lip, or valve (fig. 31, I. s.), the species reminds one of 

 Pterygascidia mirahilis Sluiter, 1904. Of the two previously loiown 

 species of the genus, herdmani resembles C. suhmi Herdman much 

 more closely than it does C. sedans Sluiter, Sluiter's species being non- 

 pedunculate. 



In general features, the siphons and orifices disregarded, C. suhmi 

 and C. Jierdmani have much in common, but the character of the 

 stigmata (fig. 33), as weU as that of the orifices, sharply differentiates 

 the species. Over large areas of the sac very little or no suggestion 

 of the quadrate or spiral disposition of the stigmata occurs in C. herd- 

 mxini. 



