33 S MANUAL OF THE MOLLUSCA. 



Cynthia, Saviguj, 1S16. 



Eti/n. A name of Diaua, from ]\It. Cynthos, Delos. 



Sijn. Stycla (pomaria) Sav, Caesira (quadridentata) Sav. 



Ex. C. papillosa, PI. 24, fig 2. , 



Bodi/ coriaceous, sessile, orifices 4-lobed, braucliial sac i)laited longitu- 

 dinally, surmounted by a circle of tentacular filaments ; ovaries two. 



Sub-genera. Dendrodoa (glandaria) IMc Leay. Sub -cylindrical, smooth ; 

 orifices terminal, minute ; ovary single, on left side. 



Fandocia (mytiligera) Sav. Right ovary only developed. 



B'lstr. Norway— Medit. Sometimes on sand and very slightly attached ; 

 or on oysters, stones and sea- weed, from low- water to 30 fathoms. Occa- 

 sionally gregarious in vast numbers, forming large bunches in consequence of 

 the interlacing of their root-fibres. The test is often orange -coloured or 

 crimson. The branchial sac, in this and the following genera, is thrown 

 into deep folds to increase its extent of surface. Greenland, Brit. 14 sp. 



Pelon^.a, Forbes and Goodsir. 



Efi/m. Felos, mud, naio to inhabit. 



Ex. P. glabra, PI. 24, fig. 3. Rothesay bay; 7 fms. 



Body elongated, cylindrical, smooth or wrinkled; orifices terminal 

 4-cleft, on two small conical eminences ; posterior end blunt pointed, villose 

 with fine rootlets; mantle adherent to the test; no tentacles; ovaries 2» 

 symmetrical. 



Distr. 2 sp. N. Brit. Norway (Mc Andrew and Barrett). 



Pelonsea resembles Sipiinculus, one of the worm-like Echiuoderms, in 

 appearance. It is not free, but rooted in mud and quite as apathetic as the 

 other ascidians.* 



Chelyosoma, Broderip and Sby. 



Etijm. Chelyon tortoise-shell, soma body. 



Type, C. Macleayanum, PL 24, fig. 4. Greenland. 



Body depressed, oblong ; test coriaceous, its upper surface composed of 

 8 polygonal plates ; orifices small, prominent, 6-valved ; gills plaited : ten- 

 tacles simple. 



BoLTENiA, Sav. 



Named after Dr. Bolten, a Hamburgh naturalist. 

 Syn. ? Bi-papillaria, Lam. 1816. Australia. 

 Ex. B. pedunculata, PI. 24, fig. 5. 



Body globular, pedunculated ; test coriaceous, orifices lateral, 4-cleft ; 

 branchial sac longitudinally plaited ; tentacles compound. 



■* Pelonsea is not so extraordinary as at first supposed. The very erroneous 

 statement at p. 32, lines 27, 28, should be erased. 



