ZOOLOGY AND EOT ANY, MICROSCOPY, ETC. 211 



The history of development is then dealt with in considerable 

 detail, and we find in the larva that the mouth-parts and the digestive 

 apparatus are very similar to those of the adult, that there are two 

 pairs of salivary glands, a paired rudiment of the genital organs, and 

 in addition to the paired double eye, sensory setee on the legs, and a 

 double pair of set« between the eyes. The six-footed larva j)asses by 

 a metamorphosis into a second free-living asexual form, the nymph, 

 and this into the sexually mature prosopon. The larv« may live for 

 a long time in water, and ova may there imdergo their normal de- 

 velopment. The nymph and prosopon are carnivorous, living chiefly 

 on Aphides ; in seizing their food they make use of their chelicerae 

 and maxillary palps. 



5. Crustacea. . 



Ecdysis of Apodemes in Crustacea.* — F. Mocquard, attracted by 

 the recent statement of Vitzen that the apodemes, with some other 

 parts, preserve their ordinary relations on the ecdysis of the lobster, 

 notes that he has observed in the exuviation of the spiny lobster, 

 that the arcades formed by the mesophragms, and the longitudinal 

 branches connected with them are broken, just as much as are also 

 the endothoracic arcades and the paraphragmal pieces of the en- 

 dosternites. In other words, all the connections between the meso- 

 phragms of the two sides, or of the same side, as well as of the 

 paraphragmal and internal branches, are destroyed at the moment of 

 ecdysis ; and this destruction is prepared for by a decalcification and 

 softening of these parts. 



In the lobster, where the arrangements are a little difierent, we 

 find likewise a division of the mesophragms along the middle line, 

 and the separation of the branches of the endopleurites from those of 

 the endosternites. Similar solutions of continuity may probably be 

 detected in the apodemes of the Brachyura. 



Blind Copepod of the Family Harpacticidse.t — The interest now 

 centering upon those animals which, through peculiarities in their 

 habitat, have dispensed with important organs, warrants, Mr. C. L. 

 Herrick thinks, the mention of a case of the disappearance of the eyes 

 in an order of Crustacea in which it has not been hitherto noticed, so 

 far as he knows. 



While collecting marine Copepoda in the Gulf of Mexico, a 

 gathering was taken from a very slightly saline marsh, a ditch passing 

 through the marsh affording the only water of sufficient depth in 

 which to use the net. This ditch, about 18 in. in breadth, but of 

 very moderate depth, extends continuously for some distance, and was 

 so shaded by high salt sedge-grass as not to be found save by accident. 

 The gathering proved to contain a new species of the sub-family 

 Longipediinaj, and closely allied to the genus Bradya established by 

 Boeck in 1872 for a marine copepod dredged in rather deep waters 

 about Northern Europe. 



The American species, which has been named Bradya limicola in 



* Comptes Eendus, xcvi. (1883) pp. 204-5. 

 t Amer. Natural., xvii. (1883) p. 206, 



p 2 



