Boone, Crustacea, Cruise of "Alva," 1931 113 



deeper corneal face being f rontolateral ; a large, circular ocellus 

 is on the median dorsal corneal margin adjacent thereto, but dis- 

 tinct from the cornea. 



Reference: Rhynchocinetes hendersoni, Kemp, S., Records In- 

 dian Mus., vol. XXVII, 1925, p. 265, figs. 3-7. 



Family: PANDALIDAE 



Genus: PLESIONIKA A. Milne Edwards 



Plesionika binoculis (Bate) 



Plate 30 



Type : The "Challenger" secured the type at Station 190, in 

 the Arafura Sea, south of New Guinea, Lat. 8° 56' S., Long. 136° 

 5' E., depth 49 fathoms, September 12, 1874, and it is deposited 

 in the British Museum of Natural History. 



Distribution : In addition to the type locality, the "Siboga" 

 secured this species at Station 302, Lat. 10° 27.9' S., Long. 123° 

 28.7' E., in the strait between Rotti and Timor, depth 216 m. ; also 

 at Station 306, Lat. 8° 27' S., Long. 122° 54.5' E., Lobetobi Strait, 

 between the islands of Flores and Solor. The "Alva" specimen 

 also comes from near Flores Island. 



Material examined: One specimen, about 60 mm. long, 

 dredged in 140 fathoms, in Flores Strait, near Larantuka Village, 

 Flores Island, Dutch East Indies, October 22, 1931. 



Technical description : The "Alva" specimen, which is not 

 quite so large as the largest of the "Siboga" series, is perfect, 

 except that the second pair of legs are missing. It measures about 

 60 mm. long ; the rostrum, from orbital angle to tip, being a decided 

 curve, of which the straight line is 18 mm., the carapace is 12 

 mm. long; the abdominal segments total 30 mm., of which the 

 telson is 12 mm. 



The carapace is finely setigerous, compact, with a very faint 

 median carina arising slightly beyond the posterior margin and 

 bearing two small, rudimentary, linear-like, acute teeth on the 

 posterior third of carapace, the median area being smooth, the 

 prerostral carina arising on the anterior third of the carapace as 

 a sloping crest, and bearing five articulated, increasingly larger, 

 sharp, procurved teeth, equally spaced, the anterior one being 

 just posterior to the orbital angle; beyond these there are above 



