A REVIEW OF THE MYSIDACEA 103 



4 males, 2 females. Philippine Islands : Collected by the Albatross 

 at Subig Bay Anchorage, China Sea, off southern Luzon, surface, elec- 

 tric light, January 6, 1908, 7 p. m., 2 males. Gilbert Islands* : Identi- 

 fied by Hansen (type). 



Distribution. — Known previously only from the Gilbert Islands, the 

 present paper extends the range to the Marshall and Philippine 

 Islands. 



ANCHIALINA PENICILLATA Zimmer 

 Anchialina penicillata Zimmer, 1915b, p. 161, figs. 7-12. 



Occurrence. — Marshall Islands : Arno Atoll, surface of the lagoon, 

 electric light, 1 male, January 24-26, 1900. Philippine Islands: 

 Albatross station 5595, surface, 2 adult and 5 immature males, 6 adult 

 breeding females. 



Distribution. — Known from the type specimen captured during a 

 voyage from Ceylon to Dampier Strait (Zimmer, 1915b) ; New South 

 Wales (Tattersall, 1940) ; Marshall Islands; Philippine Islands. 



ANCHIALINA ZIMMERI, new species 



Figure 31 



Description. — This new species is very closely allied to A. penicillata 

 Zimmer, and it agrees with that species in the densely setose orna- 

 mentation of the inner margin of the antennular peduncle in the male. 

 It should be emphasized that this character is definitely a secondary 

 sexual feature, not present in the female. The new species differs 

 from Zimmer's species in the following points : 



(1) The presence of microscopic spinules on the outer part of the 

 third joint of the antennular peduncle (fig. 31, a) and on the second 

 joint of the antennal peduncle (fig. 31, b). (2) The antennal scale 

 (fig. 31, b) is somewhat narrower than in A. penicillata, being three 

 times as long as broad, whereas in the latter it is only slightly more 

 than twice as long as broad. (3) The two joints of the propodus of 

 the endopods of the 3 to 8 thoracic limbs are subequal to the carpal 

 joint (fig. 31, e), whereas in A. penicillata the carpal joint is longer 

 than the combined length of the two propodal joints. (4) In the 

 form of the third pleopod of the male (fig. 31, /, g). The exopod is 

 11-jointed. The ninth joint has no lamellalike expansion on the outer 

 side. The tenth joint is large and swollen and has a large strong 

 spinelike process at each distal corner. The outer process is longer 

 than the inner and gently curved into an S-shape, with tubercles on 

 its outer margin. The inner process is slightly curved and is longer 

 than the spines on the terminal joint. The latter is very small and 

 almost embedded in the tenth joint, and bears three subequal spines 

 all shorter than either of the long processes on the tenth joint. 



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