PTYCHOLAIMELLTJS 337 



116. Ptycholaimellus carinatus n. sp. Cuticle rather thin and naked, resolvable 

 near the anterior extremity into elements which are interrupted on the lateral 

 fields. Near the middle of the body, the division line between the annules is 

 resolvable into dotlike elements; these are interrupted by two prominent lateral 

 wings. These wings begin near the head and end behind the middle of the tail, 

 and near the middle of the body occupy a space about equal to the width of one 

 of the annules. l-9__8^ j.5.5 "'49." 90. 

 Neck conoid ; A 3 ^ ' ~ ~ ~ *-3~ " ~2l > L 



.? Td #-^V-3S~- . . . .^;.:.-, 

 connected with the anterior margin of the cer- 

 vical cuticle by a thin, flexible membrane. 

 When the mouth is closed, it is surrounded by 

 twelve folds in the lip-region, which come 

 together and form a striated, somewhat tubu- 

 lar vestibule, having a length about equal to 

 the width of two of the adjacent annules of the 

 cuticle. The lip-region stains strongly with 

 carmine, and is a very striking feature in 

 stained specimens. The lips arch together V 1 ^ :; - :m ' f: n X 750 



over the somewhat spheroidal anterior portion of the pharynx, which is about 

 one-third as wide as the front of the head and contains the strongly cutinized 

 apex of the massive dorsal onchium, which has, passing backward from it, dis- 

 tinct refractive extensions that gradually merge into the structures of the oesoph- 

 agus. The narrow portion of the pharynx merges gradually into the lumen of 

 the oesophagus. The pharyngeal swelling contains special muscles for the oper- 

 ation of the lips and dorsal onchium; these are much more strongly developed 

 on the dorsal side, and the pharyngeal swelling presents the peculiarity of being 

 widest near its anterior part, and tapering gradually nearly half way to the nerve- 

 ring, where the diameter has been so reduced as to be one-third that of the 

 corresponding portion of the neck. The oesophagus continues to have this width 

 until after it passes through the nerve-ring, where it enlarges rather gradually 

 for a short distance, and then more rapidly to form the clavate, or elongated- 

 pyriform, strongly developed cardiac bulb, which occupies the posterior three- 

 sevenths of the neck, and becomes three-fourths as wide as the base of the neck. 

 This bulb is divided into two approximately equal parts by a transverse division 

 of the musculature and its valvular apparatus is correspondingly divided. This 

 latter consists essentially in a plain expansion of the lining of the oesophagus, 

 which is in its widest part, about one-third as wide as the bulb. There is no dis- 

 tinct cardia. The intestine joins the middle of the posterior surface of the car- 

 diac bulb, and at this point is only one-fifth as wide as the neck. It gradually 

 widens out so as to become half as wide as the body and then diminishes again 

 to give place to the enormously developed renette cell, behind which it again 

 becomes about half as wide as the body. The intestine is rather thin-walled, its 

 cross-section presenting about four to six cells containing scattered yellowish 

 granules of variable size, the largest of which have a diameter nearly as great as 

 the width of one of the adjacent annules of the cuticle. From the slightly raised 

 anus, the rectum extends inward a distance equal to the anal body diameter. 

 The lateral fields are fully one-third as wide as the body. The renette cell, two- 

 thirds to three-fourths as long as the neck, is clavate, and at its widest part half 



