Vol. XXVIII, pp. 117-120 May 27, 1915 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



. Lu 



V 



NEW SPECIES OF DECAPOD CRUSTACEANS FROM THE 



DUTCH WEST INDIES. 



BY MARY J. RATHBUN. 



Some time ago I prepared an account of the stalk-eyed crus- 

 taceans collected by Dr. J. Boeke in 1905 in the Dutch West 

 Indies. As the publication of that report has been unavoidably 

 delayed, Doctor Boeke has given me permission to publish 

 separately descriptions of the new species. The type specimens 

 are in the Leiden Museum. 



Fajhly PENEID^. 

 Metapeneeus mobilispinis sp. nov. 



Type. — Male, from Cave Round Bay, Saba, in about 4 fathoms, stony 

 bottom ; August 26. 



Measurements. — Male, length from tip of rostrum to tip of telson 

 32.4 mm., length of carapace including rostrum 9.5 mm. 



Description. — Carapace short-pubescent in front of cervical suture. 

 Rostrum ascending, short, not reaching end of eyes ; deep, lower limb as 

 wide as upper, which is convex and armed with 5-7 curved teeth. Post- 

 rostral crest continued to middle of carapace and armed at anterior fourth 

 of carapace and at posterior end of rostrum with a straight, slender spine. 

 Antero-lateral angles of carapace rounded. Postocular tooth small, 

 acute. Postantennular spine long and slender, postantennular groove 

 deep, meeting the cervical groove. A very short, oljlique and deeply 

 impressed groove on either side of rostrum at anterior border of gastric 

 region. Branchial region bordered anteriorly by a sinuous groove (part 

 of the cervical groove), and superiorly by a groove which is very deep 

 below the hepatic spine but becomes faint posteriorly and disappears 

 altogether towards the hind region of the carapace. 



Fifth and sixth abdominal terga sharply carinated at middle; fifth seg- 

 ment a little more than half as long as sixth, which is a little longer than 

 telson. Telson consideraljly shorter than inner caudal swimmeret and 

 has two slender marginal spines (the posterior the longer) on either side 



21— Proc. Biol. Soc. Wash., Vol. XXVIII, 1915. (HT) 



