168 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



Pharyngeal cavity shallow and indistinct ; apophyses well marked, tooo" long. CEso- 

 p/iaffiis about ytli of total length, with a large ovoid swelling at termination, and provided 

 with two rows of brownish pigment extending backwards on either side from two local 

 reddish-brown aggregations -^-g" from the anterior extremity and within the sheath 

 of oesophagus. Intestine covered with fat-particles, having a more or less tessellate 

 arrangement. Anus yoo" from posterior extremity. Vulva at middle of body. Ocelli 

 as above. 



Hale, length x^", breadth -2-5-5". 



Anus TTs" from posterior exterior extremity. Spicules curved, 3^" long ; accessoi'y 

 pieces two, strong, broad, 5^" long. 



Hah. Very abundant about CladopJiora rupestris and some other small green weeds 

 from tide-pools, Falmouth. 



2. C. NTJDICAPITATA, n. sp. (Plate XIII. figs. 230-232.) 

 Female, length -^", breadth e-g-g". 



External Characters. — Body tapering very slightly forwards. Head rounded, naked. 

 Integument with delicate transverse striae, tto^o " apart ; longitudinal not recognized. 



Pharyngeal cavity shallow and indistinct ; apophyses a-sij-o" long. Q^sojihagus about 

 -fth of total length ; rounded swelling at termination. Intestine sparingly covered with 

 hepatic particles. Anus ^^" from posterior extremity. Vulva slightly anterior to 

 middle of body. Ocelli two, reddish brown, at yAV fi'om anterior extremity ; occa- 

 sionally one only, in middle line. 



Male, length -^", breadth g^ "• 



Anus 3-^" fi'om posterior extremity. Spicules slightly curved, g^" long ; accessory 

 pieces narrow, and curved at inner extremities, about raVo" long. In mid-ventral region 

 above anus, Avithin the substance of the integument, are five disk-shaped, highly refractive 

 bodies, about -gV^" in diameter, whose distances apart gradually diminish anteriorly. 



Hal). On small, stunted, greyish specimens of Cladophora rupestris from tide-pools 

 near high-water mark, Falmouth. 



3. C. NATANS, n. sp. (Plate XIII. figs 236-238.) 

 Female, length ^^", breadth -5-50'- 



Fxternal Characters. — Body tapering very slightly towards anterior extremity, but as 

 usual at posterior. Head rounded, provided with four spreading setae. Integument 

 very transparent, not darkened anteriorly, having transverse striae ra^oo" apart ; longi- 

 tudinal not recognized. 



Pharyngeal cavity indistinct ; apophyses 17^" in length. (Esophagus yth of total 

 length. Intestine well covered with large-sized greenish-yellow granules, having no 

 distinct arrangement. Anus T-g-j" from posterior extremity. Vulva at middle of body. 

 Ocelli two distinct conical aggregations of red pigment, situated almost laterally on 

 the oesophagus, which is somewhat narrower at this point. 



Male, length y^", breadth -g\^" . 



Anus air" from posterior extremity. Sjnctdes rather narrow, curved, -rhr" long; 



