ENTOMOSTRACA C1RRIPEDIA. 211 



period together with those organs, whence the shape of the ccphalo-thorax 

 is altered ; moreover, the prehensile feet are in a similar manner pre- 

 sent, and besides these also, in the mature larvse two pairs of feet only 

 exist, and five in the full-grown animal. The author has never observed 

 adult males ; on the other hand, he has observed among the embryos a 

 peculiar form, differing from the rest in having a smaller, more slender 

 figure, longer antennae, and shorter legs, and which on that account it 

 appears should be regarded as the male embryo and the others as the female. 



CIKRIPEDIA. Goodsir (Edinburgh New Phil. Journ. vol. xxxv, p. 88) has 

 made a discovery, which completes our knowledge of this order in an essential 

 point, viz. that of the male. The author had conceived the opinion that 

 the Cirripedia were of distinct sexes, and that the males, like those of the 

 Leruese, were to be found, in an entirely different form, on the females. 

 After a long and fruitless search he was, at last, in May, 1843, so fortunate 

 as to discover, upon Balanws balanoides, and in fact immediately upon the 

 ovaries, an animalcule, which he did not hesitate to recognize as the male. 

 The anterior part of the body is covered with a hard shell, and consists of 

 six segments ; the first of which is semicircular, and contains a pair of pedun- 

 culate eyes, two pairs of autenual, one pair of pectinate, prehensile organs, 

 and the mouth ; the latter appears to be suctorial, and its conformation is 

 not as yet more closely examined. The other five segments have each a pair of 

 legs armed with a simple claw ; at the base of the last pair of feet are found 

 the external sexual organs. The posterior, soft part of the body is consti- 

 tuted of three portions, separated by contractions between them ; the 

 first is divided anteriorly into three lobes, and overlaps the hard-shelled 

 cephalo-thorax, so that that portion is entirely covered by it ; the second 

 segment presents on each side an arm-like process directed backwards ; 

 the third terminates in three similar processes. The whole animalcule 

 is about a Hue in diameter, but in some instances it is increased in size, 

 viz. when a parasitic Crustacean, a quarter of a line in length, belong- 

 ing to the Isopodous family of the Ionia, is contained (sometimes in large 

 numbers) in the soft part of the body. The author has also observed 

 and described (ib. p. 97-99) the larvae of Balanus balanoides and tintin- 

 naltulum. 



Elminms plica-fas, Gray : shells yellow, strongly plicated, especially at the 

 base, opercular plates thick, is given in Dieffcubach's Trav. ii, 269. 26. 



Sowerby, jun. (Ann. Nat. Hist, xii, p. 260) has made known a remarkable 

 fossil Cirriped, Loricula pukhella, from the upper chalk at Rochester, which 

 in a manner appears to stand midway between the Balauids and Lepads. 

 The peduncle is contracted at the base, and coated all round with iuter- 

 digitatiug rows of large scales. There appear to be six rows of scales. 

 Whether there are four or five opercular pieces is not clear, 



