ENTOMOSTRACA OF THE SCOTTISEI NATIONAL ANTARCTIC EXPEDITION. 289 



Pleuromamma gracilis, var. esterlyi, nov. (PI. XIII. figs. 8-10.) 



1905, Pleuromamma yracilis, Esterly, " Copep. of tlie San Diego Region," Univ. of California Publica- 

 tions, vol. ii. p. 175, text-fig. C. 



C. 0. ESTERLY, in the work referred to above, describes and partly figures a form of 

 this species which differs from what GIESBRECHT appears to consider as the typical 

 Pleuromamma gracilis especially in the structure of the fifth pair of thoracic feet 

 in the female. Dr GIESBRECHT * shows the female fifth pair to consist each of a single 

 ramus provided with three short and tolerably stout teeth, the inner one being slightly 

 the larger ; and this agrees fairly well with the specimens of P. gracilis in the Scotia 

 collections, and with Ur GLAUS' original description, where, referring to the fifth pair, 

 he says, " Der letzte Fuss des Weibchens bildet einen schmalen, undeutlich gegliederten 

 Stab und endit mit drei kurzen Zinken." t In the form recorded by ESTERLY from 

 the San Diego region a form which is also represented in the Scotia collections the 

 rami of the fifth pair of thoracic legs in the female are distinctly two-jointed and armed 

 at the apex with three tolerably long and spiniform teeth, the middle one being the 

 longest (see fig. 9, PI. XIII.). As there does not appear to be otherwise any marked 

 difference between this form and P. gracilis, and in the absence of a male, I am inclined 

 to regard this form as no more than a fairly distinct variety of Pleuromamma gracilis. 



Fam. 



Genus Lucicutia, Giesbrecht, 1898. 

 Lucicutia ftavicornis (Glaus). 



1863, Leuckartia flavicornis, Glaus, Die freilebend en Oopepoden, p. 183, pi. xxxii. figs. 1-7. 

 1892, ,, Giesb., F. Fl. Neapel, vol. xix. p. 358, pis. v., six., and xxxviii. 



1898, Lucicutia ,, Giesbrecht & Schmeil, Das Tierreich, vol. vi. p. 3. 



1904, ,, ,, Cleve, Mar. Invest. S. Africa, vol. iii. p. 192. 



The only samples in which this species was observed were collected at Stations 11, 

 36, and 49, in the North Atlantic, 23 50' N., 21 34' W., to 1 53' N., 27 26' W. 



Fam. HETERORHABDID^E. 

 Genus Heterorhabdus, Giesbrecht, 1898. 



Heterorhabdus papilliger (Glaus). 



1863, Heterochseta papilligera, Glaus, op. cit., p. 182, pi. xxxii. 

 1892, ,, papilliger, Giesb., op. cit., p. 372, pis. xx. and xxxix. 



1898, HuterorJiabdtts Giesbrecht & Schmeil, Das TierreicJi, vol. vi. p. 114. 

 1901, Hetf.rnchxta papilligera, Cleve, "Plankton from the Indian Ocean and the Malay Archipelago," 

 Kongl. Sv. Vet.-Akad. Handl., Band xxxv., No. 5, p. 7. 



This species, which appeared to be moderately rare, was only obtained in a single 

 gathering collected at Station 15, 20 34' N., 23 12' W. 



* Cf. Fauna u. Flora des Golfes von Neapel. t Die freilcbenden Copepoden, p. 197 (1863). 



(ROT. 8OC. EDIN. TRANS., VOL. XLVIII., 535.) 



