Mr. J. Lubbock on two new species of Calanidse. 159 



staining the surrounding skin ; it is seated in a depression in 

 the centre of converging corrugations. On irritating this part 

 slightly, the tortuous frilled bands (commonly called seminal) 

 that occupy so large a portion of the interior of all ActimadcB 

 were protruded. I examined a very minute portion of one with 

 the microscope, and found it to contain a few elliptical thread- 

 capsules, which presented nothing peculiar. 



I presume that the usual membranous septa run down the 

 interior cavity ; for pale longitudinal lines are seen through the 

 dimly-pellucid integuments of the body, which appear to indi- 

 cate such a structure. i • u • + 



The skin is coriaceous, not mucous, but covered with minute 

 irregularly-transverse corrugations, as if it lay excessively loose, 



and was wrinkled up. „ ^, ^ 



P. H. GossE. 



Weymouth, August 5, 1853. 



XVII.— On two new species of Calanidse, with Observations on 

 the Spermatic Tubes of Pontella, Diaptomus, l^c. By John 

 Lubbock, Esq., F.Z.S. 



[With a Plate.] 

 [Continued from p. 124.] 



Antenna. 

 Although the right anterior antennae of the males of Labido- 

 cera Darwinii, magna and Patagoniemis, Pontella Bairdii, Ano- 

 malocera Patersonii and Monops grandts, appear at first sight to 

 differ very materially from one another, and from the corre- 

 sponding antennae of the left side, which, on the other hand 

 aeree with those of the female, a little examination will 

 prove that they are all reducible to one type, and that their dif- 

 ferences are formed by the development of certain parts at the 

 expense of others. I have therefore, when describing the above 

 species, said little about these organs, intending to consider them 

 all together. Extraordinary as are the forms, and beautifully 

 adapted as is the prehensile apparatus of each, yet that which 

 has struck me most is the regular arrangement of the hau-s, ot 

 which there are five sorts. 



1st Short down, which I have only found on the external side 

 of the basal segments of the female and left male. I never saw 

 any on the right antennae of the male. 



2ndly The plumose hairs so prevalent among the Jl/uto- 

 mostraca, and which chiefly prevail at the basal portion and the 



