STATE GEOLOGIST. 95 



Small Cyclops or Vaulter, Prichard, Mec. Cab., t. 9, f. 7. 

 Amyone satyra andBaecha, Midler, Entomost., 42 t. 2 (young). 

 Der Satyr, Kohlers. 



Prichard. 



Cyclopsina stapliylinus, M. Edtvards, Hist. Nat. Crust., iii. 428. 



Canthocarpus Baird, Trans Bew. Club, ii., 154. 



Nauphilius minutus, Philippi, Weigm. and Erichs, Ar. 1843, 69. 

 Doris minuta, Koch, Deutsch, Crust., li. XXXV. t. 3, 1841. 



Variety occidentalis. Herrick.* 



Description, etc. — This variety, which is the only member of the sub-familj- 

 yet distinguished in our locality, is so closely related to the type of the species as 

 described by Dr. Baird that it is with much hesitation that it was finally co:!icluded 

 to separate it. The description given will apply to both, with such exceptions 

 as will be pointed out. 



Body rather long with no obvious distinction between the segments of thorax 

 and abdomen, composed of ten segments, which taper toward the tail. Cephal- 

 othorax acute in front, resembling that of species of Calaniis (in which respect 

 it differs from Dr. Baird's figures of the European species) forming a sort of 

 beak below. Viewed from the side the shape is triangular. The primary 

 antennae are shorter than in Cyclops, and those of the males more altered than 

 is usually the case in that genus. In the male they consist of seven joints, the 

 fourth of which is much enlarged. 



The antennse of the female possess eight or nine joints, and have a small pro- 

 jecting appendage from the extremity of the fourth segment. The secondary 

 antennae are simple with two or three joints. 



The eye is bright red and contrasts finely with the pale yellow of the body. 

 The mandibles are similar to those of the cyclops. The maxillipeds are divided 

 at the end into four divisions at the extremity of which spring three or four 

 setae. 



The first pair of feet (or second foot-jaws of Baird) are small, three-jointed 

 organs. The final joint is hook- like, and directed forward for the purpose of 

 arresting food particles and carrying them to the mouth. 



The second pair of feet are large and modified m form, differing from the 

 natatorial feet, (they form the basis of classification in this whole sub-family). 

 Each is composed of two three-jointed rami, of which the outer one has the 

 joints nearly equal with three setae. At the apex of the final one, the inner ramus 

 has the upper joint long, almost equalling the outer ramus. The second joint is 

 shorter and with the final one, which carries at the extremity three long setae, 

 is serrated on the anterior margin. This ramus is directed forward also. The 

 three following pairs have the rami unequal but both with three joints. 



The sexual openings are at the base of the sixth segment. In copulation the 

 males seize the caudal stylets with the geniculating joint of the primary antennae 

 and are bourn about rapidly by the female. 



In most of the females seen there was a organ attached to the vulva, it consists 

 of a long flexible stalk terminated by a cyUndrical or club-shaped mass, which 

 may be dark brown, red or pellucid, 



*S. A. Forbes describes a species in Report 111. Mus. Nat. Hist., the characters of 

 which I have not been able to compare with our specimens, but it seems distinct. 



