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forms to the genus Cliaetoderma but in the presence of a highly deve- 

 loped radula and various other characters mentioned in the succeeding 

 paragraphs the relationship is much more remote and I have accord- 

 ingly made it the type of a new genus, Limifossor (a digger of ooze) 

 giving it the specific name talpoideus (like a mole). 



The body of Limifossor talpoideus is relatively short measuring in 

 the largest specimen 12 mm hy 2 mm in the greatest diameter, and 

 this ratio of 1 : 6 is remarkably constant. While a ventral furrow is 

 absent a space exists between the ventral longitudinal muscles in the 

 mid ventral line corresponding to the position of the foot in the Neo- 

 menidae. The spicules, one layer in thickness, are of spearhead 

 shape andränge in size from exceedingly minute bodies on the incon- 

 spicuous prothorax to others 0,38 mm in length in the cloacal region. 

 The frontal sense organ consists of two elevated triangular disc-like 

 areas at the latero-posterior borders of the mouth/ The posterior 

 dorsal sense organ presents the appearance of a Avell defined groove 

 in the mid line at the hinder end of the body. 



The mouth cavity is devoid of any special sense organs and passes 

 insensibly into the pharynx which in turn leads into the slender oe- 

 sophagus. In the mid line beneath the front end of the radula a sense 

 organ is present innervated by a subradular commissure arising from 

 the vicinity of the buccal ganglia. The radula is of enormous propor- 

 tions, being fully one seventh the length of the body. It is of the 

 distichous type and in two specimens contains 28 transverse rows. 

 The radula sac is accordingly of large size and the matrix cells within 

 present a striking resemblance to those forming the radula of the pro- 

 sobranchs and chitons. The radula supports are likewise highly de- 

 veloped and are operated by a complex system of muscles that will be 

 more fully described at a future time. There are two dorsal salivary 

 glands in the form of small knob-like projections of the digestive tract. 

 Farther backward a well developed stomach exists and posteriorly gi- 

 ves attachment to the slender intestine and more ventrally to the liver. 

 The liver is a well developed tubular organ, with numerous irregular 

 sacculations, that ends blindly against the forward cloacal wall. The 

 gut courses backward on the right side of the body in contact with the 

 gonad and opens into the cloaca in the mid line. 



As noted previously the relations of the organs in the posterior 

 end of the body resemble in a general way those of Ch. nitidulum for 

 example. The sexes are separate and the gonad connects by two ducts 

 with the pericardium that in turn communicates with the cloaca by 

 two simple gonoducts provided Avith glandular walls. 



The heart occupies the usual position and anteriorly gives rise to 



