240 [August, 



Intestine narrow, simple. Male, attenuated at the extremities; posteriorly rolled 

 into a spiral, and furnished ventrally with numerous tegumentary tubercles. 

 Penis short, corneous, composed of two lateral portions. Female anteriorly 

 attenuated; posteriorly terminating in a strong, thick, muscular acetabulum, with 

 a posterior conoidal depression containing a single strong, recurved hook. Anus 

 and generative apertures close together, just anterior to the muscular acetabu- 

 lum. Ovum elliptical, elongated at the poles. 



The female of this curious genus of nematoid entozoa attaches herself, by 

 means of the posterior hook, to the mucous membrane of the intestinal canal of 

 the animal it infests, while the male clings to the female by winding the poste- 

 rior part of its body spirally around the posterior part of the latter, retaining 

 itself in that position through the aid of the numerous tubercles upon its ventral 

 surface, which closely apply themselves to the part of contact in the female. 



1. Synplecta pendula, n. s. 



Body faintly reddish-white, cylindroid. Annulations with from 12 to 18 trans- 

 verse muscular striae. Lobes of the head nearly equal. CEsophagus very long, 

 cylindroid, slightly dilated inferiorly. Intestine narrow, cylindrical. 



Male. Length 4 to 5 lines ; breadth l-6th of a line. Posterior fourth of body 

 forming three turns of a spiral, furnished ventrally with about 20 longitudinal 

 rows of tegumentary tubercles, or small quadrilateral plates l-1600th in. long, by 

 1 2666th in. broad, extending as far back as the anus. Tail curved, conoidal, 

 l-60th in. long from the anus, furnished ventrally with 7 or 8 pairs of minute coni- 

 cal tubercles. (Esophagus l-5th line long, l-333d in. broad; intestine l-400th 

 in. broad. Penis l-200th in. long, conoidal, obtuse, bent at free extremity, com- 

 posed of two lateral halves. 



Female. 6 to II lines long, l-5th to l-4th line broad. Posterior extremity 

 bent, dilated, terminating in a thick, oval, strongly muscular receptacle or 

 acetabulum, truncated posteriorly and excavated into a deep conical cavity, con- 

 taining a strong hook, with the point directed forward, l-200th in. long, with a 

 base l-400th in. broad. CEsophagus, in an individual 8i lines long, 1 line long 

 by l-666th in. broad at commencement, l-333d in. at termination. Intestine 

 l-450th in. broad. Ovum l-570th in. long, l-3333d in. broad. 



Habitation. Stomach and commencement of the small intestine of Emys 

 guttata. 



Remarks. The female hangs suspended by its posterior hook from the mucous 

 membrane of the stomach of the Em.ys, in which it is parasitic, while the male 

 clings closely to the female by means of its spiral folds, retaining its position 

 readily from the roughness of surface produced by its numerous ventral tubercles, 

 and also those upon the tail. I found this entozoon three times, in 15 individuals 

 of Emys guttata. In one instance it was a large female ; in the second two, 

 average size females, and one male ; in the third instance the stomach was dis- 

 tended with the worms, of which about one in five or six was male, and usually 

 clung to the largest of the females. 



CUCULANUS, Miiller. 



2. CuCULANt'S TRISPINOSUS, M. S. 



Body reddish, narrow, cylindrical, finely striated, attenuated at the extremi- 

 ties. Mouth large, sustained by a red or brown corneous capsule, presenting 8 

 radiating ribs or lines upon each side of a middle line. CEsophagus of two per- 



