486 BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



MACROCOELOMA EMTERMEDroM Rathbun 



Plate 170, fig. 2; plate 171, fig. 2 



Macrocoeloma eutheca Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 251, 



except synonymy. Not Pericera eutheca Stimpson. 

 Macrocoeloma intermedium Rathbun, Bull. U. S. Fish Comm., vol. 20, for 



1900, pt. 2 (1901), p. 75 (type-locality, off Havana, 163 fathoms; holo- 



type, male, Cat. No. 9492, U.S.N.M.). 



Diagnosis. — Rostral horns separated by a V-shaped sinus. Basal 

 half of rostrum with outer margins convex. Postero-lateral spine 

 behind widest part of carapace. 



Description. — Carapace oblong, width at orbits subequal to width 

 at branchial regions, excluding branchial spines. Constriction 

 behind orbits much less than in eutheca. Three median spines, 

 gastric, cardiac and intestinal, the latter slender and curved. A 

 larger, similar spine behind postero-lateral angle and a little above it 



on the carapace a spinule or tubercle. Lat- 

 eral margin rough with spinules, one or two 

 of which are hepatic. Orbital sheaths 

 much shorter than in eutJieca; margin 

 armed with four spines or teeth, one pre- 

 ocular, one postocular and one infero- 

 posterior spine; above some crenulations 

 and a tooth behind the sinus. Basal an- 

 tennal article armed with two long spines, 

 Fig. 138.— Macrocoeloma iNTERMEDi- the outer of wMch forms a submarginal 



UM (9492), BASAL ANTENNAL ARTICLE, • ,i l^'ilJ-U "D^i, 1™ 



XQ spme on the orbitpJ tube. Kostrum large, 



base very broad and with convex lateral 

 margins, horns divergent, separated by a V-shaped interspace. 



Pterygostomian region tuberculate. 



Chelipeds with about four short, stout, blunt spines on upper 

 margin of merus; carpus granulate; manus smooth. 



Measurements. — Male, holotype, length of carapace measured 

 from posterior margin to tip of rostral horn 25, length measured from 

 between rostral horns 21.2, greatest width at orbits 16, greatest 

 branchial width 18, branchial width without spines 16.1, width at 

 narrowest point behind orbits 12 mm. Male (Copenhagen Mus.), 

 entire length of carapace 29.6, orbital width 18.6, branchial width 

 without spines 19.7, length of horns 4.2 mm. 



Range. — West Indies; Panama. 



Material examined. — 



Off Havana, Cuba; Albatross: Lat. 23° 10' 36" N.; long. 82° 20' 

 20" W.; 122 fathoms; Co.; May 1, 1884; station 2168; 1 female 

 (7756). Lat. 23° 10' 51" N.; long. 82° 19 '03" W.; 163 fathoms; 

 wh. br. Co.; Jan. 17, 1885; station 2323; 1 male, holotype (9492). 



Off Roseau, Dominica; 40 fathoms; A. H. Verrill; 1 male (32512). 



