1<^95. ] NATURAL SCIENCES OF PHILADELPHIA. 341 



NOTES ON AMERICAN ENCHYTRAEIDiE. I— NEW SPECIES OF FRIDERI- 

 CIA FROM THE VICINITY OF PHILADELPHIA. 



BY J. PERCY MOORE. 



Five species of Friderida have been collected in the neighborhood 

 of Philadelphia, of which one is as yet insufficiently studied. Brief 

 descriptions of the remaining four follow: 



Fritiericia longa n. s. 



Length, 25-30 mm. Number of somites, 60-69. 



Anterior to the clitellum the seta? number four to the bundle, the 

 inner pair being two-thirds the length of the outer. Posterior to the 

 clitellum the bundles are constituted of a single pair. 



The spermathecse (Plate XIII, figs. 4 and 5), are provided with 

 from five to eight accessory sacs or diverticula. These are much* 

 smaller than the central sac, around the base of which they are 

 arranged in a single whorl, and, in the younger worms at least, 

 approximated in pairs. The central or primary sac is more or less 

 cylindrical, with concave, (as in fig. 4) or convex sides, in which 

 latter case it may be nearly spherical. The stalk or duct is slender, 

 and two or three times the length of the expanded portion of the 

 spermatheca; a few small unicellular glands cluster about its mouth. 



A pair of simple salivary glands (pepto-nephridia) open into the 

 oesophagus in the fifth somite. In the examples studied they were 

 quite unbranched (Plate XIII, fig. 6). 



Supra- oesophageal ganglion two-thirds as broad as long, convex 

 behind. 



The nephridia and heart were not studied. 



F. longa has been met with in only one locality, where it was ex- 

 ceedingly plentiful during the month of April of this year. This spot 

 is on a very dry bank by a roadside ; the surface soil, in which the 

 worms were found, is a thin layer of wood mould with a few 

 scattered leaves which were not sufficient to prevent the ground from 

 baking hard and dry. A later visit ( in July) found the worms in 

 very much reduced numbers and of smaller size. In movement and 



