254 



K. NAKAZAV, A : 



Diagnosis. Carapace narrowed anteriorly, with obtusely 



pointed rostrum, deeply emarginateci at the posterior edge so as to 

 form round and smooth lateral lobes (fig, 6). Eye round, with short 

 eye-stalk. Antennular peduncle very strong ; its middle joint with two 

 spines above ; base of outer flagellimi swollen and with olfactory 

 hairs in both sexes. Antennal scale reaching to second joint of 

 antennular and antennal peduncles, with apex rather straightly truncate. 

 Legs with propodite made up of io-u joints; dactylopodite invisible. 

 Epimera remarkably large. First pleopod of female (fig. 23) composed 

 of a long basal joint and two branches ; other female pleopods rudi- 

 mentary and one-jointed. Third pleopod of male (fig. 29) reaching to 

 end of last abdominal segment, its outer branch segmented into four 

 distinct joints, the first joint being indistinctly subdivided into four 

 joints in the distal parts where numerous hairs grow on the inner side. 

 Telson (fig. 35) a little longer than last abdominal segment, about 

 three times as long as broad at base ; lateral margin with 7-8 strong 

 spines. The two branches of uropod nearly equal in length, reaching 

 to tip of telson ; inner branch with 5-6 spines along its inner margin, 

 with remarkably small otolith ; outer branch armed with 14 short but 

 strong spines along outer margin. Average length of body 10.4 mm. 



Localities. Sandy beaches of: Ohara in Prov. Shimosa ; Zushi 



in Prov. Sagami ; Oarai in Prov. Hitachi. 



Notes. — This species differs from G. indiens, G, spinifer, and Haplostylus nor mani by 

 the structure of pleopods and by the shape of telson, amongst many other points. 

 Apparently it is most neariy allied to Arcluieomysi s grebnitzkii Czerniavsky of Bebring 

 Sea, though differing in no small degree in the structure of the pleopods of female 

 individulas. 



9. Gastrosrtccus h'ojlmaeitsis n. sp. 



Plate VIII., fig. 7, 20. 



Diagnosis. Carapace narrowed anteriorly ; with rostrum more 



distinct than, but posterior margin of carapace emarginate as, in G- 



