THE APODOTJS HOLOTHUKIANS 171 



REMARKS. This is another of the species known from only a single indi- 

 vidual, and as that one is obviously immature, it is possible that it will prove 

 to be the young of some previously known species. 



MOLPADIA ARENICOLA. 



PLATE XII, FIGS. 1, 2. 



Liosoma arenicola Stimpson, 1857, p. 525. 

 Trocliosioma arenicola Theel, 1886a. 



LENGTH. 110-135 mm., with the diameter one-third or one-fourth as much. 



COLOR. Dirty whitish, blotched with tawny reddish. 



DISTRIBUTION. Reported only from the vicinity of San Pedro, California 

 (Stimpson, Theel, Clark), where it appears to be quite common. 



REMARKS. This species, remarkable for its limited distribution, is well 

 characterized by the color, the absence of a distinct caudal appendage, the 

 thick, smooth skin, and the absence of calcareous deposits in the body-wall. In 

 most individuals numerous branched rods and perforated plates are to be found 

 in the skin of the posterior tip of the body, but in old specimens even these may 

 be wanting. Phosphatic deposits are apparently never present. Stimpson 's 

 error in saying the calcareous ring consists of five pieces is so obvious, it seems 

 strange Lampert ('85) should have copied it without comment. 



MOLPADIA BREVICAUDATA. 

 PLATE X, FIG. 24. 



Arikyroderma brevicaudatum Koehler and Vaney, 1905, p. 99. Calcareous particles, 

 pi. xv, figs. 1-10. 



LENGTH. 18-25 mm., with the diameter about 15 mm. ; the tail is 3-6 mm. 

 long. 



COLOR. Grayish, somewhat spotted with red. 



DISTRIBUTION. Reported only from one "Investigator" station in the Gulf 

 of Bengal, 330 m. (Koehler and Vaney). 



REMARKS. Although four specimens of this species were taken, they are ap- 

 parently young, and we probably do not yet know the adults ; but the calcareous 

 deposits are quite unique and make the species easily recognizable. 



MOLPADIA MARENZELLERI. 

 PLATE X, FIG. 23. 



Ankyroderma marenzelleri Theel, 1886a, p. 41. Calcareous particles, pi. HI, fig. 1. 



LENGTH. 26 mm. 



COLOR. Reddish violet, dappled. 



DISTRIBUTION. Reported only from near New Zealand, 1,260 m. (Theel). 



