CRYPTOTHIRIA PYGMAA. 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 finger, 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 Lirtiope (the fourth being minute and slender), 
expressly states, in the description of his figures, that his 
detached figure of this hindmost leg represents the seventh, 
or posterior one. As it is impossible, however, to over- 
look the strong relationship which evidently exists between 
the Liriope and Entoniscus Porcellane,} elaborately de- 
* Lilljeborg’s statement seems fully confirmed by Fritz Miiller’s description 
of the larva of Zntoniseus Porcellane. 
+ 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 antenne ; 
the thorax hag become an irregular inarticulate sac, beset with enormous 
brood-laminz ; 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 antennz 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 Bopyride. 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 antenne are short, inarticulate, flat, and quadrangular. The mouth 
forms a ‘‘iriangular rostrum.” ‘‘The stx 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. 
