46 UNITED STATES NATIONAL MUSEUM BULLETIN 29 6 



fore, are considered females, with this possible exception. This has 

 not been confirmed since Nilsson-Cantell's report. 



The species of the genus Lithoglyptes are the least understood of 

 the order Acrothoracica. There is no doubt that many intermediate 

 forms are found, which do not lend themselves to accurate placement 

 within the framework of species herein described. As additional work 

 is completed on this genus, probably there will be a number of new 

 species established, and some established species will be placed in 

 synonymy. More work is presently being done on this genus by 

 Utinomi, and by Newman and Tomlinson. 



Lithoglyptes indicus Aurivillius, 1892, page 133 

 Figure 5 



Diagnosis: Lithoglyptes with mantle aperture length equal to the 

 greatest width of mantle, straight, without hooks, processes, or long 

 hairs; oval or elliptical adhesive disk; no external lateral bar; free- 

 swimming nauplius. 



Distribution: Aurivillius (1892, 1894) has given us a complete 

 description of this species. He characterized it further as follows: 

 Female 6X4 mm, whitish, blue-violet on operculum and near 

 mantle; many specimens found in corals and mollusks from Java 

 Sea, Indian Ocean, and west coast of Sumatra. 



Type-material: Unknown. Present material retained at San 

 Francisco State College. 



The described female specimen, from the Israel South Red Sea 

 Expedition, Station 149/E is smaller (2.84 X 1.60 mm with a 1.15 mm 

 aperture), but otherwise generally fits the description. The aperture 

 is not as long as the mantle is wide. This discrepancy could be due 

 easily to maturational differences. The lack of apertural armament 

 and the details of the cirri and mouthparts concur as to the species. 

 The count of five and three segments for the anterior and posterior 

 rami of the mouth cirrus in this specimen can be considered not of 

 taxonomic importance, as these counts often differ in other popula- 

 tions of acrothoracican species. The body processes are variable in 

 species I have studied, and after KOH treatment they appear as 

 limp wrinkled papillae. Only one pair of these body processes are 

 figured, but another pair of wrinkles could well have been a second 

 pair of body processes. 



The mantle is studded with typically bifid teeth, scattered on the 

 posterior half of the mantle only. The mantle obviously is cemented 

 over a diffiise horny disk area, which forms an inconspicuous knob 

 at the anterior end. 



