106 ZOOLOGISCHE MEDEDEELINGEN — DEEL V. 



Rostrum as in Pen. gallensis, but the epigastric tooth much smaller 

 than the 1st of the 6 or 7. rostral teeth; abdomen also as in this species, 

 but the 6th somite almost twice as long as the 5th. External maxillipeds 

 reaching along the two proximal third parts of the antennal scale. Perae- 

 opods of 1 st pair bispinose, those of 2nd unjspinose. 



Length of the largest male 35 mm. (rostrum 3,25 mm., carapace 

 6 mm.); for the largest female these numbers are 37 mm. (rostrum 

 3,5 mm., carapace 6,75 mm.). 



Athanas Stebbingii n. sp. 



1 egg-bearing female collected February 24 '25, 1900 by the Siboga 

 Expedition at Sangkapoera- roads, Bawean-island. Depth 12 m. Bottom 

 mud. (Stat. 323). 



A new species of the Dimoiphns-grou-p, closely related to A. dimor- 

 phus Ortm. and to the female of A. polymorphus Kemp. 



Rostrum triangular acuminate, reaching just beyond the 2nd joint of 

 the antennular peduncle, measuring one-third the rest of the carapace. 

 Supra-corneal spines wanting. Extra-corneal spine acute, reaching to the 

 middle of the eyes. Infra-corneal angle rounded, reaching almost as far 

 forward as the extra-corneal spine. Xo spine near the rounded antero- 

 lateral angle of the carapace. Abdomen about one and a half as long 

 as the carapace, the telson respectively the rostrum included ; telson 

 measuring one-fourth the rest of the abdomen, l 3 / 4 - times as long as the 

 greatest width at base, distance between the postero-lateral angles nearly 

 half the width at base. 



Second antennular article measuring one-third of the first, the third 

 one-third longer than the second, a trifle less broad. Fused part of the 

 outer antennular ramus composed of 3 joints of which the 1 st or proxi- 

 mal is as long as the two following that are subequal, taken together. 

 Stylocerite large, reaching almost to the middle of 3rd antennular ar- 

 ticle. Scaphocerite almost twice as long as broad, a little longer than 

 the antennular peduncle. 



Peraeopods of 1st pair very nearly equal, projecting by the chela 

 and half the carpus beyond the antennal scale. Carpus slightly shorter 

 than the merus, the proportion being like 15 : 17, carpus 5-times as long 

 as thick at the distal extremity; chela only a trifle shorter than the car- 

 pus, fingers measuring three-fifths of the palm. 



The three posterior legs regularly diminish in length and stoutness. 

 Carpus of 3rd pair three-fifths of the merus, 4-times as long as thick 

 distally; propodus almost twice as long as the carpus, 9-times as long 



