TUNICATA. 707 



B. External tunic coriaceous, hard. Branchial orifice and anal 

 cloven into four rays. Branchial sac plicate. 



Cynthia SAV. Body sessile. 



Sp. Cynthia papillata SAV., Ascidia papillosa L., BOHADSCH de quibusd. 

 Anim. mar. p. 130. Tethyon coriaceum, Tab. x. fig. i, Cuv. Mem. PL n. 

 figs, i 3, RANG in GUERIN Mag. de Zool. 1834, Cl. v. PL 43; Mediter. ; 

 Cynthia microcosmus, Ascidia microcosmus Cuv., Ascidia Cuvierii PHI- 

 LIPPI, Cuv. 1. 1. PL i. figs. i6; the surface of the hard and wrinkled 

 covering is often beset with sertulariae, corals and conchifers ; this species 

 also is found in the Mediterranean Sea. 



Sub-genus : Dendrodoa MAC L. 

 Sp. Dendrodoa glandaria MAO LEAY L L Tab. 20, p. 547. 



Boltenia SAV. Body oval, placed on a round petiole. 



Sp. Boltenia fusiformis SAV., Vorticella Bolteni L., Ascidia clavala SHAW 

 (not PALL.), J. R. BOLTEN Epist. ad C. A. LINNE de novo quodam Zoopkytor. 

 genere, Amstelrod. 1771, 4to. c. Tab. color. ; Boltenia ovifera SAV., Ascidia 

 pedunculata SHAW, Vorticella ovifera L., SAVIGNY 1. 1. PL L fig. i, B, 

 BLAINV. Malacol. PL 8, fig. 3, &c. 



Sub-genus : Cystingia MAC L. 



Sp. Cystingia Griffithsii MAO LEAY 1. 1. Tab. 19, pp. 540 545, near the 

 North Polar-circle in Fox-Channel, met with in PARRY'S expedition. 

 Perhaps it belongs to sub-genus Boltenia legumen LESSON, Centur. zool. 

 PL 5, fig. i, pp. 149, 150. 



C. External tunic hard, composed of separate scutella. Body 

 sessile. 



Chelyosoma SowERBY. Body depressed, discoidal, adhering to 

 xreign bodies. Orifices conical, both closed by six triangular 

 alves. 



Sp. Chelyosoma Macleayanwn, Zoological Journal, 1829, xvn. p. 46, D. 

 F. ESCHRICHT Anatomisk Beskrivelse af Chelyos. Macleayanuin, Vidensk. 

 SelsJc. naturmd. og math. Skr. ix. 184?, pp. i 16, Tab. i. 



NOTE. It may suffice here simply to name the genera Pedotethis 

 and Syphonotethis, of which the author, GERVAIS, has given the 

 names alone (Ascidies, Diet. univ. d'Hist. nat. n. 1842, pp. 207, 

 208). 



452 



