46 AMPHIOTBNB AUEICOMA. 



the smallest yet observed, but its disposition is similar, for it has a slight ventral fold on 

 each side to aid in guarding the tentacles. The anterior or free edge is fringed with 

 comparatively long subulate fimbriae. The tentacles are perhaps less numerous than in 

 allied^forms, but their structure is the same, the distal ends being often flattened and with 

 a median groove joining that proceeding along the column. 



The folds at the sides of and behind the mouth in the main agree with those of other 

 species. 



The second cirrus or tentacle arises on the dorsal edge of a glandular ridge, which 

 ventralward presents two divisions, viz., an outer transversely elongated rounded 

 eminence, and a larger inner ridge which passes with slight obliquity to a median 

 division. In front of this prominent ridge are two or three minor ones, the grooves 

 of which converge toward the mouth. From the dorsal edge of the cirrus a small 

 ridge runs dorsally, but soon disappears behind the fimbriated rim of the scabrous 

 region. 



The branchiae occupy a similar position to those of Lagis Eoreni, but are specially 

 modified in so far as the lamellae of the first branchia are proportionally larger, both 

 broader and longer, and the basal axis to which they are attached is shorter. Thus the 

 apparatus is more fan-shaped and less like the scorpioidal cyme. As in Lagis the larger 

 lamellae are internal, and they gradually diminish to the small external end. The second 

 branchia is considerably less in all its parts, but it has the same abbreviation of the basal 

 axis or stem. The first branchia would appear to belong to the segment behind the 

 second long cirrus, and which sends a prominent glandular ridge to the mid-ventral line. 

 The second pertains to the ridge immediately behind, and which also passes to the mid- 

 ventral line, where, as in the previous form, a separate shield occurs. It is further 

 distinguished by a considerable, flattened, glandular lobe immediately following the 

 branchia, which would apparently act as a guard to the first branchia. So far as 

 these parts show, three segments would thus seem to pertain to the collar-region, viz., 

 that of the second long cirrus and the two branchial segments. 



The next region of the body consists of three bristled segments devoid of hooks as 

 in allied forms. The appearance of these, however, suggests a sub-division, for the 

 two anterior have the thick glandular ridges, the first with a single central division and 

 the second with two central divisions, whereas the third has only a long, slender, non- 

 glandular ridge as in those which follow. The region appears to be on the whole con- 

 siderably foreshortened in contrast with Lagis. The first two bristle-tufts are very small, 

 and they arise from the non-glandular or dorsal part of the ridge. The third is consider- 

 ably larger, and is usually closely applied to the surface of the dorsolateral region. 

 Each tuft has the stout, tapering simple bristles with traces of wings distally below the 

 tapered point, and all have, in addition, a few in which the spear-like dilatation at the 

 tip is present, with the hair-like point and serrated edge. All these bristles have a 

 peculiar ring-like dilatation at the base. 



The third region is characterised by the great development of the lateral lamellae 

 for the hooks, as well as for the long and strong bristles at the dorsal edge. All the 

 latter are very powerful anteriorly, dilating from the base upward until full diameter is 

 attained, and then tapering to a delicate hair-like tip (Plate CXXIV, fig. 2 a). Besides 



