156 " THETIS " SCIENTIFIC RESULTS. 



GONIONEPTUNUS, Ortmann. 

 GONIONEPTUNUS SUBORNATUS, Ortmann. 



GonionepUtnus suhornatus, Ortmann, Die Decapoden - Krebse 

 Strassbm^ger Museums, pt. vi., in Zool. Jahrb., ^'ii., 1893, 

 p. 79, t. iii., fig. 9. 



Fortnnns (Charyhdis) truncatus, De Haan, Fauna Jap., Crust., 

 1835, p. 43, pi. xviii., fig. 2 



Stations 37, 41. 



A small male is here referi'ed to this species ; the carapace 

 measures 17 "5 by 24 mm. 



The armature of the lateral borders and of the chelipedes agree 

 with Ortmann's description, and the specimen in every character 

 with De Haan's figure of the male.* 



The front is divided into four lobes ; the median pair are pretty 

 close to each other, and are separated by a shallow v-shaped space ; 

 a wide, rounded, granular sinus divides the inner from the outer 

 lobe, and a narrower, deep, smooth sinus exists between the latter 

 and the inner angle of the orbit. 



The carapace is clothed with short hairs, 0-6 mm. in length 

 and O'l mm. or less apart ; they are curled or directed towards 

 the front ; anteriorly they are simple ; posteriorly they are more 

 or less beset with short branchlets, which are confined to the 

 upper third ; the subterminal portion has a reddish band, and is 

 unbranched. 



The carapace bears four granulose elevations, almost in a 

 transverse line : two are situated on the mesobranchial, and two 

 submedian on the cardiac region ; there are also a pair of short 

 granular ridges posterior to the submedian interruptions in the 

 main transverse ridges. 



These granulose elevations are not mentioned either by De Haan 

 or Ortmann. They are, however, plainly indicated in De Haan's 

 figure.* 



Since the above was written two other examples have been 

 found — a male and a female ; the carapace of the latter measures 

 15-5 by 23 mm. ; that of the former 21 by 30 mm. (spines 

 excluded) ; the specimens do not differ materiall}-^ from the above. 

 There is, however, one character worth}'- of note — the posterior 

 margin of the carapace is slightly keeled, sinuated and minutely 

 granular, and the lateral angles have a prominent, rounded, com- 

 pressed lobe. 



* De Haan — Fauna Jap., Crust., 1835, pi. xviii., fig. 2. 



