Miscellaneous. 123 



ovarian bosses. The first incubatory plate is destitute of a trans- 

 verse lamella, .and its recurrent portion is of unusual length. There 

 are no dorsal ovarian bosses. The ventral bosses are two in 

 number ; the second (posterior), which is excessively long and cylin- 

 drical, seems to form the prolongation of the body of the animal, of 

 which it displaces towards the back the pleon bent into a y with the 

 cephalic part. The muscles of the wall of the body which covers 

 the ovary, notwithstanding this enormous distention, have retained 

 great power, and the ovarian bosses contract energetically. The 

 second, especially, exhibits vermiform movements, which enable it 

 to bend back and to insinuate itself, as has been said, into the tail 

 of the Crab, notwithstanding the folding forward of the latter. 

 The organs situated in the neighbourhood of the genital aperture, 

 and called seminal receptacles, are of a nearly ovoid form, and their 

 surface presents four or five lobes arranged like the ribs of a melon. 

 The liver, of a fine cherry-red colour, was filled with an abundant 

 liquid, holding in suspension concretions analogous to renal products. 

 This, however, is the ordinary aspect of the liver of the Entoniscians 

 some time after oviposition, between two periods of sexual activity. 

 This supposed liver seems to play the double part of an organ of 

 excretion and an organ of reserve. The pleon and its lateral and 

 terminal appendages greatly resemble the corresponding parts in 

 Grapsion. 



In the midst of the embryos, and attached to the folds of the 

 incubatory laminoe, there were two degraded males ; notwith- 

 standing careful search with the lens and the microscope, we did not 

 meet with any Cryptonisoian males. One of the two degraded 

 males measured 2 mill, and was in full sexual maturity ; it was 

 destined, no doubt, to fecundate the next deposit of ova. The 

 other was much smaller (one third), dead and already partially 

 decomposed ; it must have fecundated the ova then developed. 

 The degraded male resembles those of Grapsion and Portunion, but 

 it is almost entirely destitute of pigment. The caudal furca is very 

 long ; further, the median ventral hooks are placed upon the seventh 

 thoracic segment (genital segment) and on the first pleal segment ; 

 the second pleal segment only bears a small rudimentary tubercle. 

 The males of all the Entoniscians at present known bear no median 

 hook upon the genital segment. The appendage of Priapion is of 

 quite a different nature. In Pinnotherion the apertures of the 

 deferent ducts are situated, not upon the median appendage, but 

 towards the anterior margin of the seventh segment. 



The spermatozoids, fixed by osmic acid and examined, after colora- 

 tion, with homogeneous immersion, present the complex structure 

 of the spermatozoids of the Thoracostraca, but they have not the 

 streaks characteristic of those of the Lobster, Cray-fish, &c. 



The embryo greatly resembles that of Grapsion and Portunion. 

 It is strongly pigmented with brown and green, notwithstanding 

 the obscurity of the medium in which it is developed. Its eyes are 



