\S25^. arranged in Natural Families* ^ ^X 101 



3. PoLLiciPES, Hill (n.3). 



• Shelly plates, 33 or 35. The posterior and posterior ventral 

 pair, and dorsal plate large; the rest (14 or 15 pair), small, 

 forming two or three series, the hinder ones largest ; peduncle, 

 covered with shelly scales, bald. 



1. P. cornucopia. Leach. Lepas poUicipes, Lin, Ramphi-. 

 doma vulgaris, Schum, P. Smithii is not distinct from this 

 species. 



4. Calantica, Grai/, 



Shelly plates, 15. The posterior and posterior ventral pair and 

 the dorsal plate large ; with eight smaller scales, forming one 

 series, of which the dorsal and ventral are the largest; pe 

 duncle scaly, covered like the shelly plates with hair. 



C. Homii, nob. PolHcipes tomentosus. Leach, (descrip.) P. 

 hispidus. Leach, (plate). 



1 have dedicated this extraordinary species to Sir E. Home, 

 who has most carefully examined the structure of the animals 

 of this class. 



5. Capitulum, Klein. ^>^» ^/ 



. Shelly plates, 34. The posterior and posterior ventral pair, 

 large, subarticulated ; the lateral medial pair, and the dorsal 

 and ventral plate middle sized, long triangular ; with a series of 

 13 pair of small plates, at the top of the peduncle ; peduncle, 

 scaly, bald ; shelly plates subsulcated. 



This genus appears to be intermediate between this and the 

 next section. I do not know its habits ; it may be Lithophagous 

 or a Lithodome. Rumphius is the only author who has figured 

 its peduncle. 



C. Mitella, Grai/. Lepas Mitella, Gmelin, 



^^ Shelly valves transverseli/, acutely, and reversedly sulcatedf 

 forming one series. Forming or living in holes in rocks, shells, &c. 



LiTHOTRYA, Sowerby (n. 18). 



Shelly valves, eight ; two pair lateral, one dorsal, one ventral, 

 and a series of minute shelly scales. Peduncle short, thick, 

 reversed conical, with a hole at the anterior part near the attach- 

 ment; attached to a concave, irregular, shelly valve. Living in 

 holes in rocks, perhaps formed by itself, as the irregular plate, 

 appears to move gradually down its side. 



L. dorsalis. Sow. Lepas dorsalis, Ellis. Absia Lesuerii, 

 Leach, MSS. 



Mr. Sowerby only describes seven valves. 



Ibla, Leach, without character. ■ • 



Shelly valves, four ; posterior pair elongated, slightly curved ; 

 ventral pair, triangular short ; peduncle cylindrical, contracted 

 near the attachment, covered with hair-like processes. 



I. Cuvieriana, LeacA, M^SaS. Yalves transversely annulated,^ 

 larainse pointing towards the peduncle. Mus, Brit. 



