2(54 CEYLON MARINE BIOLOGICAL REPORTS. 



Linton (13) describes a second species of Plalybothrinm, without naming it. It differed from 

 I'latybothrium cermnum in liaving two faint costa' on tlio posterior end of each botlirium, in only being 

 lialf the size, and in being densely beset vvitli oonioal spinulos. 



As only a single specimen was obtained, he did not venture to bestow a specific name, and pointed 

 out that the differences named might be due to the second types of this genus being young strobila. 



Pktlyhothrium spinulifera. n. sp., corresponds exactly with Linton's description of his second 

 type, save tliat there is no intermediate middle piece or connecting bar which unites the antler-Uke 

 pairs of hooks which overliang the bothridia. As our specimens are all adult, they are obviously new 

 species. 



The indications of a second septum on a tew isolated bothridia in our specimens shows how nearlj' 

 related the genera Acanthobothrmni and Platybothrium are, the principal difference being that in the former 

 the bothridia are divided by two septa into three loculi, whilst in the latter genus the bothridia are divided 

 b\' one septum into two loculi. The general shape of the head and hooks in two genera are, however, 

 very different. The presence of minute cuticular spinules has been noted in certain members of the genera 

 Phoreiobothrium (Phoreiobothrium lasium) (II) and Cylindrophorous (Cylindrophorous typicus, Dies) (1). 



ANTHOBOTHEttTM, Van Beneden. 



Body elongated, articulate, depressed. Supplemental discs (auxiliary acetabula) none. Head 

 separated from the body by a neck. Bothria four, ojjposite or unilocular, cup-shaped or subglobose, 

 affixed by a contractile pedicel, highly versatile, unarmed. Genital aj)ertures marginal. (Diesing.) 



Anthobothrium floraformis, n. sj). (Plate I., Figs. 8, 9, and 10.) 



Measurements. 



Extreme length 

 Breadth of head 

 Approximate length of neck 

 Length of tenninal proglottid 

 Breadth of terminal proglottid 



Head. — ^The head consists of four deeply concave bothridia, with very thick rims, borne on 

 contractile pedicels. The bothridia are variable in outline, some being almost circular, whilst others are 

 somewhat kidney -shaped. Then- ijedicels are capable of a considerable degree of contraction and 

 elongation. In the majority of specimens the bothridia present a somewhat " Maltese cross " appear- 

 ance, but one specimen has the bothridia borne on very distinct stalks. Other specimens have the 

 pedicels so contracted that they cannot be seen, the bothridia being drawn up close together, and 

 apparently sessile. The general appearance of the head is that of a four-petaUed flower, hence the specific 

 name. There is no trace of a myzorhynchus, there are no auxiliary suckers on the edges of the bothridia, 

 and the latter are not divided into areolas. 



The neck is long and very slender, and is almost the same diameter throughout. It is apparently 

 cylindrical, and it merges rather suddenly into the broader strobila posteriorly. The cuticle of the 

 neck is markedly wi'inkled transversely. 



The proglottides are not numerous, their number averaging about twelve or thirteen. The 

 anterior ones are very indistinctly differentiated, and their sides are straight and practically parallel. 

 They are almost square, being very shghtly broader than long. The sides of the riper proglottides are 

 slightly convex. The strobila is oval in transverse section. It shows considerable variation, however, 

 in all the characteristics, some abnormal specimens having the ripe segments almost globular, and others 

 having them somewhat attenuated. 



The genital pores are situated laterally in the anterior third of each proglottid. In the majority 

 of specimens they are all on one side, but a few had one or two pores on the alternate side. However, 

 the pores are very indistinct, and it is not easy to detect them. No cirrlii were observed. 



