CRYPTOTHIRIA PYGM^IA. 265 



the youngest state of the animal, has only six pairs of 

 legs, the sixth being half as long again as the others, 

 and terminated by a very slender elongated linger, whilst 

 the five preceding pairs are of equal size, and sub- 

 cheliferous.* Rathke, on the contrary, although he 

 only figures four of the legs on one side of the body 

 of his Liriope (the fourth being minute and slender), 

 expressly states, in the description of his figures, that his 

 detached figure of this hindmost leg represents the teventk, 

 or posterior one. As it is impossible, however, to over- 

 look the strong relationship which evidently exists between 

 the Liriope and Enioniscus Porcellance^ elaborately de- 



* Lilljeborg's statement seems fully confirmed by Fritz Miiller's description 

 of the larva of Entoniscus Porcellance. 



t The female of this remarkable parasite resides within the body of a 

 species of Porcellana, lying in a thin- walled sac between the liver, intestine, 

 and heart of its host, the head being " destitute of eyes and antennae ; 

 the thorax has become an irregular inarticulate sac, beset with enormous 

 brood-laminae ; the long vermiform and extremely mobile abdomen has sword - 

 shaped legs ; and swelling out above it in a globular form, as if in a hernial 

 sac, the heart lies at the base of its first segment ! " The young of this sin- 

 gular parasite closely resembles that of Bopyrus and Liriope, being oblong- 

 ovate and flattened in form, with one pair of antennae very short and thick, 

 whilst the other pair is half the length of the body, and bent backwards. 

 ' ' The five anterior segments of the thorax bear similar feet, terminated by a 

 thickened ovate palm, and a slightly curved powerful claw. " The sixth pair 

 of legs are only three -jointed, the last joint being elliptical. There is no 

 seventh pair of legs. " The abdomen bears, first of all, four pairs of natatory 

 feet, with a crescentiform basal joint, and a lancet-shaped terminal joint, 

 furnished with strong bristles." The fifth abdominal pair of legs is a narrow 

 and short appendage, without bristles, cleft into two unequal divisions ; and 

 the terminal pair of appendages consist of a thick basal joint and two slender 

 biarticulate terminal branches. 



The male somewhat resembles that of the Bopyridce. The body is elongate- 

 obovate and regularly articulated, the head is trapezoid, with rounded angles 

 extending considerably beyond the sides of the following segment. The only 

 pair of antennae are short, inarticulate, flat, and quadrangular. The mouth 

 forms a "triangular rostrum." "The six anterior thoracic segments bear 

 feet reduced to nearly sessile inarticulate roundish lumps. The seventh seg- 

 ment has no feet, but bears on each side, at the posterior margin, a wart-like 

 process, and on this the genital orifice." The abdomen is considerably elongated 

 and narrow, composed of six segments entirely destitute of appendages. 



