1909.] CRUSTACEA OF THE GENUS GENNADAS. 723 



of podobranchs on the first three pairs of pei^eiopods — G. parvus 

 is distinguished by the greater distance between the cervical and 

 post-cervical grooves, by the strongly acute infra-antennary angle, 

 by several details in the oral appendages, and by the form of the 

 petasma. 



Gennadas intermedius Spence Bate. (Plate LXXIII. figs. 7-1 2 ; 

 Plate LXXY. fig. 3.) 



Gennadas intermedius, Sp. Bate, * Challenger ' Crustacea 

 Macrura, 1888, p. 343, pi. Iviii. fig. 3. 



St. 106. Ofi"Siexra Leone. 1° 47' N., 24° 26' W. Trawl. 1850 

 fathoms. One male, the type specimen, ca. 48 mm. 



St. 120. Ofi" Pernambuco. 8° 37' S., 34° 28' W. Trawl. 675 

 fathoms. One male, ca. 46 mm.* (sub G. ^jar-wzts 

 Sp. Bate.) 



This species is evidently one of the more primitive species of 

 Gennadas, and is closely allied to G. alicei Bouvier. Both the 

 specimens are unfortunately in bad condition. 



The rostral crest (PL LXXIII. fig. 7) is only slightly elevated 

 above the dorsal carina of the carapace, presenting a marked 

 contrast to that found in the preceding species. The inferior 

 margin is not convex. The fringe of setse between the apex of 

 the rostrum and the dorsal spine was evidently present originally, 

 although scarcely a trace of it now remains. The antennary and 

 infra-antennary angles are both bluntly rounded and very obtuse ; 

 the emargination between them is shallow, but not altogether 

 missing as in G. alicei. The branchiostegal spine is wholly absent 

 in the type specimen, but an exceedingly minute point is visible 

 on one side of the second example. The hinder part of the cara- 

 pace is distorted and crushed in both specimens ; the distance 

 between the cervical and post-cervical grooves (measured dorsally) 

 is however great, probably one-half the distance from the post- 

 cervical groove to the hinder margin of the carapace. The mid- 

 dorsal carina is traceable throughout the length of the ca,rapace, 

 although faint in the posterior half. 



The eyes are in bad condition, but the width across the cornea 

 seems to be less than in G. alicei. The second joint of the an- 

 tennular peduncle, measured dorsally, is equal in length to the 

 third joint. The antennal scale is broken in every instance, but 

 it is evident that it is not strongly narrowed apically. 



The distal joint of the mandibular palp (PI. LXXIII. fig. 8) is 

 slightly longer than the width of the first joint. In the second 

 maxilla the anterior lobe of the internal lacinia is constricted 

 behind its apex, and is distinctly broader than the adjacent lobe 

 of the external lacinia. In the latter lacinia the anterior lobe is 

 fully one and a half times the width of the posterior lobe. The 

 apex of the endopod has not exactly the same character in the two 



* In the bottle with this specimen there is a label in Dr. Hansen's writing, which 

 reads — " Aajrees with the type of G. intermedius, Bate, not with G. parvus." 



49* 



