IIG MR. H. CHARLTON BASTIAN'S MONOGRAPH 



rounded ; no papillse. Integument thick ; transverse striae very distinct, yroe" apart, 

 liaving lateral pores and three larger equidistant channels opening through anterior part 

 of ventral region. 



CEsophogiss about -jth of total length ; constricted portion t4^" lo^ig- Intestine 

 sparsely covered with light-coloured fat-particles. Anns -^" from posterior extremity. 

 Spicules cuneiform, slightly curved, 3^" long. Accessory jjiece small and indistinct, 

 somewhat triangular. 



Female, not seen. 



Sab.' Mud from freshwater ponds, Falmouth ; and Easthampstead, Berks. 



2. T. SALSA, n. sp. (Plate IX. figs. 18, 19.) 



Female, length \", breadth -^^' . 



External Characters. — Body cylindrical, tapering much the same as last. Head more 

 rounded, provided with two papillae, lateral (?). Integument thinner; transverse striag 

 not so well marked. 



(Eso2)Iiaffm ^th of total length; constricted portion large, ^W ^^^^S- Intestine 

 covered with rather large, light-coloured fat-particles. An7(s oV from posterior ex- 

 tremity. Vnlva posterior to the middle of body. Uterus bifid. lateral canals in- 

 distinct, Tooo " IJi'OfKi. 



Male, not seen. 



Sab. About the roots of Bilppia maritima, brackish water, Swanpool, Falmouth. 



8. DIPLOGASTEE, Max Schultze. 

 Gen. Char. — Bodi/ tapering at extremities, especially at posterior. Caudal sncJcer very 

 small, scarcely recognizable. Integument having longitudinal and also delicate 

 transverse markings ; setae none (?) ; papillae none (?) ; small lateral cervical mark- 

 ings. Fharynx cup-shaped, having two horny valvular plates at the bottom. (Eso- 

 phagus having a well-marked muscular swelling about its middle ; canal of anterior 

 half indicated by three bright lines ; not so, however, posterior to muscular swelling. 

 Intestine moderately covered with fat-particles, having a more or less tessellated ap- 

 pearance. Vulva about the middle of body. Eterus bifid, segments symmetrical. 

 Spictd.es two, curved, barbed. Accessory piece single, posterior, easily recognizable. 

 Ventral excretory gland wanting. Lateral canals . . . 

 Movements very active. 



1. D. FiCTOR, n. sp. (Plate X. figs. 71-73.) 



Female, length ^s", breadth 5-g-o". 



External Characters. — Body white, slender, tapering very slightly anteriorly, but con- 

 siderably posteriorly, where it gradually tapers to a fine point ; sucker not recognizable. 

 Head truncate, unarmed. Integument with longitudinal striae too^oo" apart, and almost 

 imperceptible transverse striae 20000 '^ apart. 



Pharyngeal cavity 33V3" deep. (Esophagus ^}th of total length, swelling in the 

 middle, 7x4" long. Intestinal cells containing a moderate number of light-coloured par- 



