36 



MAKINE ISOPODS FKOM THE PHILIPPINE ISLANDS. 



This species differs from Cryptione elongata Hansen a m having the pleopoda of the 

 female not tuberculate, but smooth, and the outer branches differently shaped, in the 

 differently shaped distal half of the first lamellae of the marsupium and in the appear- 

 ance of the terminal abdominal segment of the male. 



Genus MUNIDION Hansen. 



Munidion laterale, sp. nov. 



Body of adult female somewhat asymmetrical, nearly twice as long as wide, 8.5 mm.: 

 16 mm. Color, in alcohol, yellow. 



Head large, deeply immersed in the first thoracic segment and with a rather wide 

 border on the anterior portion. Eyes absent. 



The seven segments of the thorax are distinct. Lateral bosses are present on the 

 first four segments. All seven segments have pleural lamellse, which extend the 

 entire length of the lateral margin. 



All six segments of the abdomen are distinct, the terminal segment being small and , 

 triangular in shape. The first five have the pleural lamellae well developed, leaf- 

 like; the sixth segment has no pleural lamelke. There are five pairs of double- 



o 6. c d 



Fig. 33.— Munidion laterale. a, Female, X 21; b, male, X 9f ; c, first lamella of marsupium, X 7£; d, 



seventh leg of female, X 15}. 



branched pleopoda with leaf-like lamellae. The uropoda are biramous, the branches 

 long and subequal. The five pairs of incubatory lamellae do not quite meet on the 

 ventral side, but leave a small opening. 



The legs are all prehensile and have the basis furnished with a high carina. 



The male is narrow, elongate. The head is small, transversely oval, and without 

 eyes. All seven segments of the thorax are distinct. The segments of the abdomen 

 are fused in a single piece, the sides of which are somewhat sinuous. There are no 

 pleopoda or uropoda. 



One male and one female were collected, at station 5247, Dumalag Island (S.) S. 

 78° W., 4 mi. (7° 00' 00" N., 125° 137' 00" E.), at a depth of 135 fathoms, in mud. 

 They were found in the branchial cavity of a galatheid. Type specimen, catalogue 

 number 40923, United States National Museum. 



This species differs from Munidion princeps Hansen & in the form of the lateral 

 bosses, in the smaller pleural lamellae of the abdomen, which do not conceal the 

 abdominal segments dorsally, in the differently shaped distal half of the first lamella 

 of the marsupium, and in the differently shaped abdomen of the male. 



a Bull. Mus. Comp. Zool., Harvard College, vol. xxxi, no. 5, 1897, p. 112-115, pi. m, fig. 5-5a; pi. rv 

 fig. 1-lg. 



b Bull. Mus. Comp. Zool., Harvard College, vol. xxxi, no. 5, 1897, p. 115-117. 



