44 A. E. Verrill — New Actinians. 



part. Margin with a row of simple, round or conical verrucse 

 similar in structure to the others. Mesenteries in several 

 cycles with but six perfect pairs (in the type). Sub marginal 

 sphincter well developed, endodermal, circumscribed. 



Differs from Aulactinia in not having lobate marginal ver- 

 rucae. The structure of the column-wall is also different: 

 From Bunodactis it differs, so far as known, in having but six 

 pairs of perfect mesenteries, as in very young examples of the 

 latter. Should larger specimens of Bunodella be found to 

 have a greater number of perfect mesenteries, this group 

 would not differ essentially from Bunodactis. 



Anthopleura Down Yer. Figure 8. 



Trans. Conn. Acad. Sci., i, p. 4*74, 1869; Andres, op. oit, p. 223, 1884 (Dovii). 



This species was pretty fully described by me in 1869, but 

 the anatomy was not then given. 



A medium sized example, 40 mm across, in alcohol, has about 

 96 pairs of mesenteries, of which 48 are perfect and fur- 

 nished with large plicated muscles along most of their breadth ; 

 a pair of very small imperfect mesenteries, without gonads, 

 usually intervenes between each perfect pair. The mouth has 

 two large siphonoglyphs and about 22 crenulations on each 

 side. Sphincter muscle well circumscribed, ovate in section, 

 not very large. Larger submarginal tubercles or actinobranchs 

 have 4 to 6 lobules on the lower side, each with a small point, 

 appearing as if perforated, though the openings, said to exist 

 in life, are not visible (fig. 8). Adhesive, cup-shaped suckers, 

 of the longer rows, reach the base. Panama to San Salvador. 



Anthopleura Stimpsoni Yer., Comm. Essex Inst., vi, p. 32, 1869. 

 Figure 9. 



This species has 12 pairs of perfect mesenteries, with large 

 muscles along most of their breadth ; 12 pairs of 3d cycle, well 

 developed ; about 24 pairs of 4th cycle, of small size and 

 barren ; all the others, except directives, bear large gonads. 

 Sphincter muscle circumscribed, rather large, ovate in section. 

 Actinobranchs (fig. 9) crowded, three to five in the larger rows, 

 the upper one three to five lobed or digitate, the larger lobes 

 often subacute and perforated. Adhesive suckers large, in 

 unequal rows. Hong Kong, China. Type. 



Bunodosoma, gen. no v. Type, B. granullfera (Les.). 



General form and appearance as in Bunodactis, but the 

 hollow verrucse, arranged in vertical rows, are rounded or 

 subconical and do not form adhesive suckers. Upper or sub- 

 marginal ones are larger and in mature specimens more or less 



