METAPENEUS DISTINCTUS. 133 



that are probably wanting in the other species of the 

 akayebi-grou-p. 



Length of female 60'°™.. 



7. Metapeneus quinquedentatus, n. sp. 



Station 37. Sailus ketjil, Paternoster-islands. Depth 

 27 M. and less. 



Station 99. Lat. 6°7'5 N. ; long. 120^26' E. Ancho- 

 rage off North-Ubian. Depth 16—23 M. 



Station 109. Anchorage off Pulu Tongkil, Sulu-archi- 

 pelago. Depth 13 M. 



Station 164. Lat. 1°42'5 S. ; long. 130°47'5E. Depth 

 32 M. 



Station 184. Anchorage off kampong Kelang, south 

 coast of Manipa-island. Depth 36 M. 



Station 209. Anchorage off the south point of Kabaëna- 

 island. Depth 22 M. 



Station 240. Banda-anchorage. Depth from 9 — 45 M. 



Another new species of the Metap. akai/ebi-grouip and 

 devoid of a stridulating organ. 



Rostrum directed obliquely upward, short, reaching to 

 the far end of the 1st joint of antennular peduncle, hardly 

 beyond the eyes; it is constantly armed with five teeth, 

 in addition to the gastric tooth, that is situated at the 

 anterior fourth of the carapace. Sixth abdominal somite 

 measuring three-fourths of carapace without the rostrum. 



Lower (inner) flagellum as long as the two last joints 

 of the antennular peduncle. 



First legs bispinose, second unispinose, third unarmed. 

 Legs of the 5th pair with exopodite, reaching with their 

 dactyli beyond the eyes. 



Left branch of petasma extending beyond the right; 

 left branch with rounded tip, curved towards the right, 

 which is less enlarged than in Metap. mogiensis. 



Thelycum consisting 1" of a posterior transverse plate, 

 cut into three lobes, the broader middle lobe hardly reaching 



Notes from tlie Ley den IVIuseuni, Vol. XXIX. 



