STATE GEOLOGIST. 169 



If this form be worthy a distinctive name, it may be called 



Sp. 2. Cantliocamptus tenuicaudis. (Sp. n.) 

 (Plate 0. Figs. 15 and 16.) 



? Sp. 3 . Canthocaniptus brevipes, Sars. 



This small form is almost certainly the young stage of some other 

 •species; yet I transcribe the description. 



"Corporis forma et magaitudine C. pygmaeo noa dissimilis. Segmenta abdominalia 

 vero postice magis attenuata seriebusque aculeorum destituta. Rami caudales elongati 

 duplo longiores quam latiores, setis apicalibiis brevisculis parumquedivergentibus, ex- 

 teriore dimidiam longitudinem interioris non attingente. Operculum anale absque 

 ■dentibus. Antennae l-mi paris breves, articulis ultimis duobus inunum confluentibus 

 articiilum. Pedes natatorii brevissimi, ramo exteriore intus setis destitute, interiore 

 biarticulato in pedibus l-mi paris longitudinemjexterioris gequante, in sequentibus multo 

 breviore. Pedum 5-ti paris articulus basalis intus in processura foliiformem, sat mag- 

 num et angustatum, articulum ultimumelongato-ovatum aliquanto superautem, exit. 

 •Color albidus. Longit. param supra Vg mm." 



Sp. 4. Cantliocamptus crassus, Sars. 



Robust; segments margined with pectinate bristles. Caudal 

 stylets oval, contorted, constricted at the base. Antennae thick, 

 densely covered with long setae. Fifth feet with long setae; basal 

 process rpther small. All the feet excepting the first, with bi- 

 articulato inner rami. Length 0.75 mm. 



Sp. 5, Cantliocamptus trispinosus, Brady. 



(Plate 0. Figs. 6—14.) 



This species with the last and next has all the feet save the first 

 with bi-articulate inner rami. Very near the next, from which it 

 Pilfers in the form of the fifth foot of the female, which has the 

 basal process smaller, bearing only three spines, while the next has 

 six, the second joint being longer and narrow. The male is un- 

 known. Not yet identified in America. 



Sp. 6. Cantliocamptus nortliumbricus, Brady. 



Body robust; antennae long as first segment, nine-jointed; man- 

 <iibular palp minute. In the male the inner branch of the third foot 

 is three-jointed and dactylate, as in C. minutus. 



