TUNIC ATA. 313 



Mantle yellow ; strongly muscular on the long siphons and the anterior half of 

 body, less so over the viscera and posteriorly (fig. 21). 



Branchial Sac with six well-formed folds on each side converging to the oesophageal 

 aperture. Stigmata running transversely in place of longitudinally, so as to cross the 

 internal bars at right angles (fig. 24). There are thus no meshes, and the wide 

 vessels between the rows of stigmata run more or less parallel with the folds in place 

 of across them. The folds have six to eight bars, and the interspaces two or three 

 each. The connecting ducts supporting the bars sometimes come from the transverse 

 vessels, and are sometimes interstigmatic. 



Dorsal Lamina represented by a row of closely placed small tentacular languets 

 (fig. 22), smaller and more distant in front, rather stouter and much closer together 

 further back. 



Tentacles compound, of three sizes : six of the largest, six of the second, and twelve 

 of the smallest size. 



Dorsal Tubercle having a simple ovate slit (fig. 22) placed in the mouth of a deep 

 triangular peritubercular area. 



Alimentary Canal forming a long narrow loop placed transversely to the body 

 (fig. 21) ; stomach ridged longitudinally. 



Gonads one on each side (fig. 21), long irregularly lobed yellow bodies, lying 

 transversely in a curve concave anteriorly. 



Locality : Station LIV., in the north part of the Gulf of Manaar, 10 fathoms. 



This form is certainly closely related to S^UITER'S Halocynthia transversaria from 

 Ki Island and Banda, in the Malay Archipelago, but differs in so many minor points 

 from the "Siboga" specimens that I place it as a distinct variety, " manaarensis" 

 The Ceylon specimen agrees with SLTJITEB'S description in the remarkable transverse 

 arrangement of the stigmata and in the general characters of the tentacles and the 

 dorsal tubercle, but differs in the following points : The sandy investment of the 

 body is much slighter and the shape is different, allowing the two siphons to stand 

 out prominently (Plate III., fig. 20). The interspaces between the branchial folds 

 have only two or three internal longitudinal bars each (fig. 24) in place of seven as in 

 SLUJTER'S specimens. The examination of further material will, no doubt, show 

 whether these differences are bridged by intermediate conditions, or whether they are 

 maintained as the characters of two closely related species. 



The living specimen is described in our field-notes as " milky grey, mottled and 

 streaked with dull purple ; thin coating of hairs with mud on surface." 



Cynthia crinitistellata, HERDMAN. Plate III., figs. 25 to 29. 



One small specimen from Station IV., off Karkopani, 6 to 9 fathoms. Size, 

 1*4 centims. in length x 1/5 centims. in breadth x 7 millims. 

 This species is only known from Port Jackson. 

 The five specimens in the collection " of the Australian Museum, Sydney x were 



2 s 



