48 UNITED STATES NATIONAL MUSEUM BULLETIN 296 



mandibles with palps, and two pairs of maxUlae. The mandibles have 

 three stout teeth and many finer ones on the inner angle, wdth nu- 

 merous pairs on the inner edge and lateral surfaces. The maxillae are 

 typical, and have not been figured separately. 



The mouth cirrus consists of two multisegmented rami on a two- 

 jointed protopod. The number of segments in the rami are difficult 

 to count with confidence, but there are at least five and three in the 

 anterior and posterior rami, respectively, each heavily bristled. The 

 distal shorter segment of the protopod bears bristles. 



The terminal cirri in this specimen were missing, so no description 

 of them will be given other than to note that there are four pairs. 



The paired uniramous caudal appendage is noteworthy in that it is 

 three-segmented, with a short basal segment arising between the 

 posterior cirral pair, a segment of medium length follows, upon which 

 a segment of great length bears at its distal end a cluster of bristles 

 about as long as the last segment. 



Several naupliar larvae are in the mantle cavity. These could have 

 been free-swimming, inasmuch as no capsular membrane was seen. 

 The original description includes a statement ascribing free-swimming 

 nauplii to this species. 



A male was embedded in the right side of the female, almost com- 

 pletely covered by mantle tissue. No antennules were seen, but a penis 

 is present. Judging from Aurivillius' figure of a male (1894), and the 

 shape of the male on this specimen, the penis must be extended through 

 the narrow end of the body, i.e., to the outside through the opening 

 left in the mantle. Such an insemination path via the mantle aperture 

 to the brood chamber in the mantle cavity would require a penis of 

 tremendous length and control capability! 



Lithoglyptes bicornis Aurivillius, 1892, page 134 

 Figure 6 



Diagnosis: Lithoglyptes with mantle aperture length only one-third 

 of the greatest width of mantle, weakly arched, equipped with two 

 pairs of bristle-bearing conical processes; caudal appendage 3-jointed; 

 whitish except for dark violet striations below the aperture; 2.5 X 1.5 

 mm; few specimens found in corals in Java Sea. 



I did not see this species, inasmuch as no specimen \vith these 

 general characteristics had such a short mantle aperture. Otherwise, 

 it very much resembles L. spinatus. The above constitutes almost 

 the entire description of this species. See the section on Phylogeny 

 (page 151), and figure 6. 



