TUN1CATA. 307 



Dorsal Tubercle with one minute opening at the apex of a deep triangular peri- 

 tubercular area and about 20 supplementary ciliated funnels further back, but in front 

 of the ganglion, and opening into the perihranchial cavity (see fig. 35). Pre-branchial 

 zone with slight papillae scattered over it. 



Alimentary Canal rather large, with very weak walls, and having the wide 

 intestine distended with mud containing many diatoms. 



Locality: South ends of Cheval and Periya paars, Station XLIX., 8 to 12 fathoms; 

 one perfect specimen and a broken fragment of another, much larger, with no viscera. 



Family : MOLGULID^. 



Molgula taprobane, n. sp. Plate IV., figs. 14 to 19. 



External Appearance. Erect, rounded oblong, unattached, with the two short 

 siphons near together on the anterior end, not diverging. Covered with fine sand 

 (fig. 14); size, about 1 centim. across. 



Test thin and soft, with a thin coating of sand. 



Mantle thin and transparent (figs. 15 and 16). 



Branchial Sac with seven folds on each side. Each fold shows three bars. The 

 stigmata are for the most part straight or very slightly curved between the folds, but 

 (in each side of the dorsal lamina (fig. 17) they are well coiled. 



Tentacles, 12 of one size, moderately branched, not bushy, with much smaller inter- 

 mediate ones, and very minute simple tags between these. 



Dorsal Lamina a plain narrow membrane (fig. 17). 



Dorsal Tubercle obliquely cordate, with the aperture directed laterally and back- 

 wards (fig. 19). 



Gonads present on both sides. 



Localities: (1) Station LIIL, 10 miles north of Cheval Paar, 9 fathoms; (2) 

 Station XXII., Trincomalee, 13 fathoms; (3) Station XL VI., off Mount Lavinia, 

 30 fathoms. Fig. 18 shows the specimen from Trincomalee. 



The specific name of this first Molgula recorded from Ceylon is the ancient classical 

 name of the island. 



Ctenicella ridgewayi, n. sp. Plate IV., figs. 20 to 23. 



External Appearance. Body globular, free, covered with sand. Both siphons at 

 anterior end divergent (fig. 20). Size, 1*3 x 1 centim. 



Test thin, covered with adhering sand. 



Mantle with muscular siphons, and having the marginal lobes pinnate (fig. 22). 



Branchial Sac with seven folds on each side. There are four bars on each side of 

 the fold and the anterior extremities of the folds are papillose. The meshes are large 

 and each contains many well-coiled stigmata (fig. 23). 



Tentacles much branched, and at least 12 in number. 



Dorsal Lamina a plain membrane. 



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