904 Vn. J. RENNIE AND MU. 11. WISEMAN ON THE [DeC. 11, 



Description of Species. 

 TUNICATA Lamarck, 1816. 

 Order I. Ascidiacea Blv. 1827. 

 Sub-Onler 1. AscidisB Simplices. 



Family HALocYNTiiiiDiE Yen-ill, 1879. 

 {Cynthiidoi Savigny, 1816.) 



' Halocynthia rubrilabta Verrill. (Plate LXIV. figs. 1-6 &, 8.) 

 This species was repi'eseiited by a fair number of specimens, 

 the external characters of which agree well with previous 

 descriptions. The foui'-lobed branchial and atiial apeitui'es ai'e 

 conspicuous. The avei'age height is 34 mm., width 22 mm. The 

 reddish test is conspicuous only in a few specimens, most appearing 

 of a dull dii'ty white colour. The inner' surface of the test is 

 smooth and glistening. The mantle is very thin except where the 

 muscular strands are present. These are very numerous and 

 exhibit a regulai- arrangement, the longitudinal bands radiating 

 excentrically fi'om near the atrial opening (fig. 5) and forming a 

 network over the branchial sac (fig. 1). Of some interest is the 

 fact that the tentacles are compound, presenting some degree of 

 complexity (fig. 2). Van Names specimens fi-om Bermuda were 

 " simply pinnate .... and of various sizes." We observed none 

 in this species which could be so described. The dorsal tubercle 

 shows a pair of well-curved horns (fig. 3). The ovary is yellowish 

 in colour ; the testes are pale and club-shaped. These glands 

 form a double row on both sides of the animal, and in most cases 

 the serial aiTangement is very noticeable (figs. 4 and 5). 



Locality. Attached to bottom of lighter, St. Vincent Harbour. 

 Formerly I'ecorded from Bermuda, adherent to stones, shells, 

 corals, &c., common in shallow water. 



Styela partita Stimpson. (Plate LXIV. figs. 7 it; 9.) 



Several examples of this species wei-e found. From earlier 

 accounts (Veriill, Van Name) it is evidently very vaiiable in all 

 parts of its range. The Cape Verde examples agi-ee well with Van 

 Name's description of Wood's Hole specimens. Mr. Ci-ossland 

 supplies a note that externally they w^ei-e " yellow on a dai-k brown 

 ground." At Bermuda they are, according to Van Name, '' more or 

 less reddish or brownish yellow, or greyish yellow, becoming brown 

 or red on the upper surface, especially about the siphons." 

 A^errill's " alternate striping of red and white in the apertures '*' 

 has not been observed in the present examples. They measure 

 about 43 mm. long and 26 mm. wide. The test is coriaceous, 

 varying from 2 to 4 mm. in thickness. It is I'oughest ai-ound 

 the apei'tures. The number of tentacles is about sixteen, and 

 they appear uniform in size. These, however, accoi-ding to 

 Van Name, are variable characters depending upon size and age. 



