H 



of the posterior pairs of pleopods longer than the exopod and the endopod of the fifth pair 

 long-er than that of the fourth. But as our knowledge of this interesting type is still imperfect 

 as to some points of importance (the pleopods in adult males and females, the number of 

 marsupial lamellse), I did not find it advisable to take it into account in the synopsis. 



A. Suborder LOPHOGASTRIDA. 

 This suborder comprises two families; both are represented in the collection. 



I. Family Lophogastrid.ï: G. O. Sars. 



In his "Challenger" work G. O. Sars described four genera: Lophogaster M. Sars, 

 Ceratolepis G. O. S., GnatJiophausia Will.-Suhm, and Chalaraspis Will.-Suhm ; since that time 

 no new genus has been added. The "Siboga" collection contains representatives of three genera, 

 viz. Lophogaster, Gnat/iop/iausia, and a new type, Paralophogastcr \ to be described in the sequel. 



Lophogaster M. Sars. 



Three species are known, viz. L. typicus M. Sars (1856), L. longirostris Faxon (1896), 

 and L. spinosus Ortm. (1906). The "Siboga" captured several species of a new form. 



1. Lophogaster intermedius n. sp. PI. I, figs. \a — 1 e. 



Stat. 153. August 14. Lat. o°3'.8N., long. i30°24'.3E. 141 m. Bottom fine and coarse sand 



with dead shells. Dredge. 1 specimen (cf). 

 Stat. 166. August 22. Lat. 2°28'.5S., long. i3i°3'.3E. 118 m. Bottom hard, coarse sand. 



Trawl. 10 specimens (1 <ƒ, 99 with marsupium). 

 Stat. 204. Sept. 20. Lat. 4 20' S., long. I22°58'E. Between islands of Wowoni and Buton ; 



Northern entrance of Buton-strait. From 75 to 94 m. Bottom sand with dead 



shells. Dredge and townet. 2 specimens (9 with marsupium). 



Description. About the middle half of the dorsal surface of the carapace very 



finely granulated. The rostral process (fig. 1 a) projects somewhat beyond the front end of the 

 antennular peduncles and is about as long as the breadth of the frontal plate just behind the 

 origin of the antero-lateral processes. The antennal squama (fig. 1 b) is between two and a half 

 times and two times as long as broad, with 4 to 6 teeth along its outer margin. Telson (fig. 1 e) 

 has only a single pair of lateral spines (in a single case 2 spines on one and 1 spine on the 

 other side) in addition to the usual two pairs around the tip; the terminal pair of the last- 

 named spines are from nearly two and a half times (fig. 1 d) to three times (fig. 1 e) as long 

 as the other pair. 



Length of a male 21.3 mm., of females with marsupium 18 — 20.5 mm. 



Remarks. — This new species is on the whole closely allied to L. typicus, but differs 

 in a number of minor characters. The granules on the dorsal side of the carapace are much 



