130 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



divided by a narrow constricted portion from the broad vas deferens. Spicules and 

 accessory piece united together ; segments of former 4^4" long. Spermatozoa cylindrical, 

 ■50^00" loiis> having slow oscillating movement. AI(B two, composed of a hyaliae mem- 

 brane extending on each side from -g-rs" above anus to posterior extremity, supported 

 by nine rays in sets of one, two, and three. 



Hab. Marine, in sand from tide-pools, Falmouth. 



2. R. LONGICATJDATA, n. sp. (Plate X. figs. 63, 64.) 

 Female, length xi's breadth 2^ "• 



External Characters. — Body white, tapering gradually anteriorly, but more abruptly 

 towards the posterior extremity, which is long and filiform. Head truncate, naked. 

 Integument with longitudinal strise, towo" apart ; transverse not recognized. 



Pharyngeal cavity cylindrical, ytco" ^ou^ by 50^00 '^ broad. CEsophagus ^th of total 

 length. Intestine very broad at commencement, before it is compressed by genital 

 organs ; covered by only a very few scattered fat-particles. Amis y^" from posterior 

 extremity. Vulva very slightly anterior to middle of body. 



Male, not seen. 



Sah. Sandy soil about roots of wheat, Broadmoor, Berks. 



3. E-. ORKATA, n. sp. (Plate X. figs. 65-67.) 

 Female, length -^", breadth 5-5-0". 



External Characters. — Body white, tapering anteriorly, but more posteriorly, where 

 it is filiform. Head truncate, naked. Integument very transparent, with transverse 

 striae -20000^" apart ; longitudinal not recognized. 



FUaryngeal cavity ttVt" long. CEsophagus about ^th of total length. Intestine, just 

 at commencement, devoid of hepatic granules ; remaining portion sparingly covered with 

 large and rather dark-coloured particles. Anus yoo" from posterior extremity. Vulva 

 exactly in centre of body. 



Male, length -^3", breadth -53-5". 



Anus 4^" from posterior extremity. Spicules not very broad, slightly curved, yfg" 

 long, and connected with a posterior median accessory portion of one-half the length. 

 Alee lateral, same as in II . marina. 



Hab. Between sheaths of leaves, stalks of wheat in stubble-fields, Broadmoor, Berks. 



4. R. ACUis, n. sp. (Plate X. figs. 68-70.) 

 Female, length 3^5", breadth -^". 



External Characters. — Body white, tapering forwards and also towards posterior ex- 

 tremity, which terminates in a sharp point. Head truncate. Integument with trans- 

 verse striae, 2000 0" apart ; longitudinal not seen. 



Pharyngeal cavity -2^0" long. CEsophagus about ^th of total length. Intestine 

 covered vnih. few but large and dark-coloured hepatic granules. Anus -j^" from pos- 

 terior extremity. Vulva slightly posterior to middle of body. 



Male, length ^", breadth 9^9". 



Anus YYi' from posterior extremity. Spiiciiles double, xiro" long, united to a post- 



