342 
Elminius simplex Darwin. 
Port Western; Victoria; 3—4 fathoms, hard bottom. 5/IX 14. Two small 
specimens. 
The specimens are only slightly ribbed longitudinally, but in 
other respects they agree very well with Darwin’s description 
(1853). Nevertheless some differences are found in the structure 
of the animal, both in the mouth parts and in the cirri. 
The labrum (Fig. 75) has somewhat protruded side parts, 
whereas in the preceding species it has a more evenly rounded 
outline; the notch is fairly well de- 
veloped; its crest is destitute of 
hairs, but adorned with some few, 
very minute denticles. 
In the man di ble the interval 
between the two upper spines is 
large, almost occupying half the cut- 
ting edge; on the other hånd, the 
fourth tooth is rather prominent, and 
the pectination at the lower angle 
results in comparatively long spines. 
The maxi 11a has a broad notch below the two upper spines, 
and the brush at the lower angle is as long as the shorter spines 
of the edge above it, and thus far better developed than in the 
preceding species. 
Darwin has already pointed to the characteristic features of 
the cirri: in cirrus III the rami are of equal length, and pect- 
inate spines are wanting in all cirri. The segments of the posterior 
cirri have only three pairs of spines, and the hair tuft between 
the spines is only very feebly developed. 
Fig. 75., Elminius simplex from Port 
Western, a labrum, b mandible, 
c maxilla. [X 44]. 
Elminius sinuatus Huttori. 
Paterson Inlet, Stewart Island, N. Z. 18/XI 14. In great numbers on lit- 
toral mollusk shells. 
This characteristic small form has never been figured. When 
symmetrically developed it is easily recognisable owing to the two 
prominent cristae of each compartment (Fig. 76); on the other hånd, 
when the species occurs in crowded assemblies the cristae are not 
