34 UNITED STATES NATIONAL MUSEUM BULLETIN 296 



The aperture measures 3.37 mm long, measured as a straight line 

 from one end to the other. 



On the exterior of the mantle near the aperture, a border of fine 

 hairs and a curious scaly appearance to the epidermis extends down 

 to about the level of the mouthparts. The opercula are reinforced by a 

 pair of lateral bars at the middle, extending down along the mantle 

 on both sides. These are not as well formed as those of the Crypto- 

 phialidae, and they are not marked with a honeycomb pattern as are 

 some of the kochlorinids. 



The orificial knob extends laterally as a smooth band perpendicular 

 to the apertural opening, at the dorsoposterior end of the aperture. 

 A curious sack-like invagination of this end of the aperture can be 

 seen in side view, and is presumably a flexible connector for the two 

 lips of the aperture. The horny attachment disk composed of many 

 layers of mantle cuticle is prominent, and covers essentially the entire 

 dorsal side of the mantle. 



There are good longitudinal and "circular" muscle bands. 



The head is slightly pointed, and is scattered with very fine hairs. 

 The labrum is present and large, but not heavily chitinized. The 

 mouthparts, consisting of the mandibles with palps and two pairs of 

 maxillae, are typical of the group. The palps and second maxillae 

 (not illustrated, cf. fig. 2d, e, f) are similar to those of other species. 



The mandible bears the typicq^l three major teeth diminishing in 

 size toward the inner or inferior angle, with a pointed cluster of three 

 or more smaller teeth forming the inferior angle. Fine hairs are found 

 on the inner surface. 



The first maxilla has two major teeth with a smaller one usually 

 present between them, a conspicuous notch without armature, and 

 two clusters of small teeth and bristles set on separate elevated 

 portions of the inner inferior margin. 



Segmentation of the mouth cirri tends to be obscure or vestigial, 

 making it difficult to describe. Counts for the anterior and posterior 

 rami have been recorded as 5 and 5, 5 and 4, 4 and 4, 4 and 3, and 

 even 3 and 3. I would suggest that none of these be considered, and 

 that the segmentation be listed as "obscure." The protopod is two- 

 segmented. 



The smaller posterior ramus is attached to the protopod on the 

 outside of the larger anterior ramus. Bristles are prominent on the 

 inner surfaces of both rami, especially the larger anterior one. 



There are five pairs of biramous, multisegmented terminal cirri. 

 The setation is typical for the suborder. The lesser curvature of each 

 segment supports a distal pair of long setae and a central, shorter 

 pair. There is a much shorter single seta lying between the distal pair. 

 The distal end of every second to fifth segment along the greater 



