1883.] Zoology, 795 



Forbes ?" It is at least the southern representative of this spe- 

 cies, which consequently is distributed from the Great lakes in 

 Minnesota to the gulf. The similarity to C. bicuspidatiis Cls., is 

 very close. 



The description of Epischura (pp. 384-85) was written before 

 the second part of Mr. Forbes' paper was obtained, and in making 

 up for the press, the generic description given in that place was 

 not referred to. It might be inferred from remarks on p. 384, 

 that in E. lacustris the female has a structural modification of the 

 abdomen, which is obviously not stated by Forbes. 



Although the writer has since succeeded in rearing one Cope- 

 pod (Canthocamptus), and observing the transition from one of 

 the dimorphic conditions to another, and the two stages, in both 

 of which eggs are carried, are strikingly diverse, it should be 

 admitted that perhaps too much confidence was expressed in the 

 inferred conclusions upon Diaptomus. 



It may be that Brady has confused two distinct species in his 

 account of D. castor, inasmuch as his descriptions disagree with 

 those of Sars, It is evident that the same peculiarities of distri- 

 bution maintain in England as here, however explained. Correc- 

 tions and information bearing upon these questions are earnestly 

 solicited. 



An opportunity for comparing types of Diaptomus pallidus 

 with D. sicilis shows that the differences are even less than indi- 

 cated, consisting of the greater robustness of the latter and a 

 greater elongation of the antennae in the former. There is a dif- 

 ference of .1™™ in the length of the living adults seen. — C. L. 

 Herrick. 



The"Coxal Glands of Arachnida and Crustacea.— In this 

 journal for September, 1875, we described certain gland-like 

 organs of Limulus, supposed to be renal in their nature, situated 

 at the base of the legs. We then said that the organ " in its gen- 

 eral position and relations was probably homologous with the 

 green gland of the Decapod Crustacea, and its homologue in the 

 lower orders of Crustacea, which is supposed also to be renal in 

 its nature. It may also possibly represent the organ of Bojanus 

 in the Mollusca, which is said to be renal in its function. It per- 

 haps represents the glandular portion of the segmented organs in 

 worms." 



In the Proceedings of the Royal Society, No. 221, 1882, Pro- 

 fessor Lankester, in a paper *' On the coxal glands of Scorpio, 

 hitherto undescribed and corresponding to the brick-red glands 

 of Limulus," revoking his first expressed opinion {Quart. Journ. 

 Mic. Sci., 1 881) that these were not " of a glandular nature at all," 

 concludes from histological examination that they are glands, and 

 calls them " coxal glands." He was also unable, as were our- 

 selves, to find any openings into the great veins, or " to detect the 

 situation of their opening to the exterior." Lankester then de- 



