116 UNITED STATES NATIONAL MUSEUM BULLETIN 296 



Dimensions: The type-specimen measured 1.72 X 0.87 mm in length 

 and width, with a neck 0.54 X 0.23 mm in length and ^vidth. The 

 aperture measured 0.28 in length. The paratype's measurements were 

 2.49 X 1.29 mm with a neck 0.52 X 0.60 mm, Avdth an aperture 0.26 

 mm long. 



The mantle is typical of the genus, with a long, thin neck between 

 the main sack and the aperture. The two most characteristic features 

 of the species are found on the mantle: the apertural armature and 

 the lateral bars. 



The lateral bars are a pair of heavy, uniform rods that project 

 posteriorly from the area of the mantle aperture. They bend dorsally 

 near the posterior end, and terminate in a long, chitinized ridge bearing 

 recurved, claw-like teeth. The left lateral bar termination possessed 

 eight such teeth, while the right one had five. The second specimen 

 had three such teeth on each side. 



In addition to the main pair of lateral bars, two much smaller 

 reinforcing bars occur in the mantle of the dorsal side of the neck. 



Teeth are scattered about on the external mantle surface, particu- 

 larly on the ventral half and near the aperture. Just below the aperture 

 a'transverse row of teeth cross the mantle on each side. These teeth 

 number about five on each side, and are two-pointed. Heavy teeth 

 occur ventroposteriorly on the mantle surface. These are four- to seven- 

 pointed on prominent circular bosses, and seem to point in several 

 directions, especially posteriorly. 



The mantle aperture is equipped with three pairs of prominent 

 bumps or hillocks, each armed with many long, sharp, serrated spines 

 and long.hairs (see fig. 30b) . These spines on their separate prominences 

 and their resemblance to a headdress of spines suggest the trivial name 

 of cordylacis. On the external surfaces of the apertural area are many, 

 finely serrated, comb-like ridges extending parallel to the aperture. 

 The ventral end of the aperture is equipped on the inside with the 

 typical comb collar. 



The fungal attack greatly harmed the appearance of the body itself. 

 The mouthparts look typical: a long labrum, setose near the distal 

 end; a mandible is present, along with mandibular palps; the first and 

 second maxillae are typical of the genus. The mandible has delicate 

 teeth, while the first maxilla possess hairs and an apodeme (fig. 30 c, d) . 



The presence of mouth cirri could not be verified. Before dissection 

 of the type there appeared to be a pair of small knobs in a typical 

 position, but without bristles. After dissection no mouth cirri could be 

 discerned. The paratype showed nothing. If present at all, they are 

 extremely reduced. 



