FROM THE INLAND SEA OF JAPAN. 423 



The short eye-peduncles do not quite reach the extremity of the first joint of the 

 antennular peduncle ; there is a sharp, forwardly directed spiae on the upper side of 

 this extremity. Six sharp teeth or spinules occur at the pterygostomian angle of the 

 carapace, and there is a small antennal spine just below the orbits. 



The sixth segment of the abdomen is almost twice as long as the fifth, but a little 

 shorter than the tapering telson, which is 7 mm. long; the postero-lateral angles are 

 acute. The telson, which is rounded above, carries two pairs of minute spinules, which 

 were overlooked by Ortmaun ; the anterior pair a little nearer to the proximal than to 

 the distal extremity, the posterior a little nearer to the latter than to the anterior pair. 

 The tip of the telson is not truncate (" abgestutzt "), as is said in the original description, 

 but it ends in a sharp tooth, on either side of which are inserted, as usual, two movable 

 spines, of which the outer is just as long as the median tooth, the inner twice as long. 

 The lateral swimmerets are a little shorter than the telson. 



The short external maxillipeds reach as far forward as the eye-peduncles. The second 

 joint of the carpus of the second legs is twice as long as the fii"st, the third appears 

 a little shorter than tlie first ; the chela is nearly as long as the second joint, the fingers 

 slightly shorter than the palm. 



Eggs very numerous, small. 



This specimen is of a pale greenish colour, the gastric region more yellowish brown. 



Geograplilcal Distribution. — Japan, Tanagava {Ortmann). 



HIPPOLYSMATA, Stimpson. 



HiPPOLTSMATA viTTATA, Stimpson. (PL 33. figs. 49, 50.) 



Hipimhjswata vitiata, Stimpson, in Proc. Acad. Nat. Sciences Philadelphia, 1800, p. 26. 

 Hippolysiiiata vittatii, var. svbiilis, Thallwitz, Deca])oden-Studien, 1891, p. 22. 



Nauticaris unirecedens , Speuce Bate, Report on the 'Challenger' Macrura, 1888, p. G08, pi. 110. fig. 1. 

 Nee Hippolysmata vittata, var., de Man, in Archiv f. Naturg. 53 Jahrg. 1888, p. 494. 



Two egg-bearing females and one young sjjecimen from the Inland Sea of Japan. 



Dr. W. T. Caiman, of the British Museum, was so kind as to examine for me the single 

 typical specimen (?) of Nauticaris uini-ecodens, Sp. Bate, from Hong Kong, and con- 

 cluded that this species ought to be considered identical with Hippolysmata vittata^ 

 Stimps., from the same locality ; this was also my supposition. " The type specimen of 

 Nauticaris unirecedens" so wrote Dr. Caiman to me, " is a little larger than is stated by 

 Spence Bate. I think it would measure about 29 mm. ia length, but I cannot attempt 

 to straighten it for fear of damage. The postero-lateral angle of the fifth abdominal 

 segment is distinctly more produced and more acute than in the original figure. The 

 sixth segment is longer than the fifth (about 20 : 20). The flagellaof the antennules are 

 wanting, and I cannot even lind any fragments of them in the bottle. There are no 

 arthrobranchia? on the peraiopods, but there are epipods on all except the last pair. 

 1 have compared the specimen with Stimpson's dcscriptiou of Mippolysmata vittata, and 

 I think it very likely, as you suggest, that it is the same species. At all events, I cannot 

 find any character which distinctly contradicts this supposition." 



