Mr. J. Lubbock on two new species of Calanidae. 119 



the left leg, the second (counting from the base) appears to be 

 composed of two segments. The basal segment is attached by its 

 external basal angle to the apex of a strong crescent-shaped pro- 

 cess, the horns of which point inwards. The second is longer and 

 thinner, and, as I have just noticed, appears to consist of two ; it 

 bears a strong spine at the external apical angle. The third is 

 very strong and muscular, as in the other species of this genus; 

 it is attached to the inner apical angle of the preceding segment. 

 Besides the large claw at the base, which forms with the suc- 

 ceeding segment a prehensile apparatus, there is a smaller spine 

 directed backwards. On the external margin, which in the or- 

 dinary position would be lowest, there are two rounded pro- 

 jections, of which the apical is the largest and appears to be 

 transversely striated or furrowed. The portion which answers 

 to the large moveable claw of the alhed species is here, as in 

 them, attached to the external apical angle of the third segment, 

 but in the present species it gradually increases in size from the 

 base, is produced at the apex into a large claw, which with the 

 corresponding one of the third joint forms a prehensile appa- 

 ratus, and appears to consist of three segments, of which the 

 second and third bear a hair each, and the third a long cylin- 

 drical appendage, provided at the apex with a small spine and 

 two hairs. 



The abdomen (figs. 1 & 2) is entirely without legs. That of 

 the male consists of four segments, terminated by two 2-jointed 

 lamellae, exactly as in L. Dancinii. 



The abdomen of the female is two-jointed and swollen trans- 

 versely. The right side is more swollen than the left, and bears 

 on the back a large spine. 



This appears to be the best place to mention what I have to 

 say about the impregnation. There is a very interesting paper 

 by Siebold in the ' Annales des Sciences Xaturelles,' 1840, 2nd 

 ser. t. xiv. p. 26, " Sur I'accouplement du Cyclops Castor •" and 

 in order to make my own observations more intelligible, I shall 

 quote a part of what he says, premising that the Cyclops Castor 

 now forms the genus Diaptomus, and, with Pontella, Cetochilus, 

 &c., has been separated from the old family, Cyclopidse : — 



" Ce qui passe pendant que ces animaux se tiennent ainsi 

 embrasses est un des phenomenes les plus remarquables dans le 

 regne animal, et dont on n^avait jamais eu une idee. Un tube 

 cylindrique, rempli d^un liquide spennatique, s'echappe de 

 I'ouverture sexuelle du male immediatement apres I'embrasse- 

 ment ; le male saisit ce tube aussitot qu'il est sorti et le coUe 

 contre le ventre de la femelle, audessous de la vulve 



" Chacun de ces tubes spennatiques renferme trois masses bien 

 diflferentcs entr^elles. Une des matieres contenues est blan- 

 chatre et epaisse ; elle a la propriete de ne pas se dissoudre dans 



