6 ART. 5. T. AIDA. 



This is a stout species. It has many epidermal unicellular 

 glands on trunk : on the dorsal side, there are one in the middle 

 of the posterior margin of hood and four in a longitudinal row 

 in the middle of genital region, the second one in this row being 

 a multicellular gland {clg., figs. 9, 11, 12, PI. I.). On the vent- 

 ral side, there are : a pair near the anterior end of endostyle ; 

 another pair in front of heart ; three in a transverse row along 

 the posterior side of the alimentary mass ; and a patch of large 

 glandular cells (branchial gland of Salensky^^) at the posterior 

 end of endostyle, extending postero-laterally to the right spiracle 

 {bg., fig. 11. PI. L). 



The lip is well developed and its ventral portion is divided 

 by a median notch into two lateral lobes, which are thick and 

 have each a vertical row of tactile cells (fig. 10, PI. L). A 

 membranous ridge arises from each of these lobes. It runs along 

 the inner side of lip, and meeting its fellow of the opposite side 

 in the middle of the dorsal lip, forms a transverse velum, the 

 free margin of which is ciliated (>'/., fig. 10, PI. I.). 



The endostyle is very slender and long and makes «harp 

 bending at two places, so that it appears box-like in side view. 



The stomach and rectum are spherical. The intestine is not 

 distinct. The ovary is spherical and lies behind the stomach. 

 The testis is large and long and extends between the rectum and 

 the posterior end of trunk. 



The largest specimen I have measured was 2066 /i long in 

 trunk and 2766 n long in tail. Maximum breadth of tail 1000 n, 

 and that of its musculature 266 jx. 



1) W. Salensky. Etudes anatoiuicjiie sur les Appendiculaires. Mémoires de l'Académie 

 Impériale dos Sciences de St. Petersbourg, 190-1. 



