910 ON THE ASCIDIANS OF CAPE VERDE ISLAND. [DeC. 11, 



placed laiiguets. Both languets and branchial papillfe i-esemble 

 each other in size. 



The tentacles ave simple and few in nnmber, probably 8. 



The dorsal tubercle is an oval slit. 



The alimentary canal is of an opaque, greyish-yellow colour. 

 The stomach has 10-12 longitudinal folds. The rectum is long 

 and wide. 



Three small pieces were found. The most distinctive characters 

 of this species appear to be the presence of distinct branchial 

 papillfe, the number of stomach-folds, and the short post- 

 abdomen . 



Family Didemnid^e Giard, 1872. 



Leptoclinum sp. 



One small colony of Leptoclmum (PL LXV. fig. 23), growing on 

 calcareous algae, came under observation. The zooids were quite 

 disintegrated, and no diagnosis beyond that of the colony was 

 possible. 



The colony in general appearance is white. An outer layer of 

 a thin crust and a lower layer fairly thick, gelatinous and brownish, 

 seemed to have at one time contained the zooids. 



The systems are not well defined. 



Common cloacal ajDertures are not apparent. 



The branchial apertures are 6-lobed. 



Stellate calcareous spicules are very numerous. 



Literature referred to. 



Herdman, W. a. — Report on the Tunicata collected during the 



Voyage of H.M.S. ' Challenger.' 



Part 1. Ascidiai Simplices. 1882. 

 Part II. Ascidiae Composita?. 1886. 

 Herdman, W. A. — " A Revised Classification of the Tunicata." 



Journal of the Linnean Society, Zoology, 1891, vol. xxiii. 



p. 558. 

 Tan Name, Willaed G. — " The Ascidians of the Bermuda 



Islands." Trans. Connecticut Academy of Arts and Sciences, 



vol. xi. 1902. 



EXPLANATION OF THE PLATES. 



Plate LXIV. 



Fig. 1. Part of branchial sac oi Saloci/ntJiia ruhrilabia. X 250. (p. 904.) 



2. Tentacles oi H. ruhrilahia. X 250. (p. 904.) 



3. Dorsal tubercle of S. rubrilabia. X 250. (p. 904.) 



4. Kiglit side ; 5. Left side of S. ruhrilabia, showing ovaries (o), testes (t), 



intestine (t), and renal organs (r). X 40. (p. 904.) 



6. Dorsal lamina showing languets of B". rM6rjZa6/a. X 250. (p. 904.) 



7. 8ti/ela partita Stimpson. X 2. (p. 904.) 



8. Salooi/nthia rnhrilabia Verrill. X 2. (p. 904.) 



9. Dorsal tubercle of Sti/ela partita. X 220. (p. 905.) 



10. Ascidia obliqiia Alder. X 1. (p. 905.) 



11. Dissection of Ascidia obliqua showing coils of intestine, stomach, and 



gonads. X 1. st, stomach, (p. 905.) 



