98 MR. H. CHARLTON BASTIAN’S MONOGRAPH 
External Characters.—Body tapering slightly anteriorly, but gradually to a point 
posteriorly. Head truncate; no setze. 
(Esophagus th of total length. Zntestine rather thinly covered with fat-particles, 
Anus zbo from posterior extremity. Spicules slightly enlarged at upper extremities, 
745 long. 
Female, not seen. 
Hab. Sandy mud from stream, Falmouth. 
4. M. LONGICAUDATA, n.sp. (Plate IX. figs. 5, 6.) 
Female, length ~y", breadth 415". 
External Characters.—Body tapering slightly anteriorly, more considerably behind 
vulva, and terminating in a very long filiform extremity. Head truncate; no setz, | 
(Esophagus about #th of total length. Intestine rather thinly covered with fat-par- 
ticles, having indistinct tessellation. Anus +y” from posterior extremity. Vulva near 
middle of body. Uterus unsymmetrical. 
Male, not seen. 
Hab. Fine sedimentary sand, pond, Tunbridge Wells. 
5. M. FILIFORMIS, n.sp. (Plate IX. figs. 7, 8.) 
Female, length „4”, breadth 4414. 
External Characters.—Body long and narrow, scarcely tapering at all anteriorly, but 
narrowing behind vulva, and thence onwards, so as to terminate in a long filiform extre- 
mity. Head truncate; no sete. 
Gsophagus 5th of total length. Intestine sparingly covered with fat-particles. Anus 
160 from posterior extremity. Vulva considerably behind middle of body. 
Male, not seen. 
Hab. About liverwort, from pier of bridge just above water-level, river Blackwater. 
6. M. pissuNota, n.sp. (Plate IX. figs. 12, 13.) 
Male, length 35", breadth ThE: | 
External Characters.—Body tapering slightly anteriorly, and also gradually to a point 
posteriorly. Terminal sucker small; another large and prominent in the mid-ventral 
region, 1006 from posterior extremity. Head rounded; no sete. Integument plain, 
having a circular depression on each side of head 1,155" in diameter. | 
Pharyngeal cavity very small, conical. Œsophagus about 3th of total length. Intestine 
having a sphincter with traces of a valvular apparatus occupying its commencement 
which is devoid of granules; remaining portion covered by very large cells, apparently 
arranged in two rows. Anus sis from posterior extremity. Genital duct opening 
separately 3355" above anus. Spicules at anal cleft, slightly curved, 515" in length, with 
two (?) small triangular accesso: leces, S, . 1.» do i owly 
undulating movement. *Y pieces. Spermatozoa linear, +553” long, having E 
Female, not seen. 
Hab. Marine, in sand from tide-pool, Falmouth. 
