CESTODE PARASITES. 271 



two very small sucker-like pits. Tlie four proboscides are a little longer than the head and neck. The 

 proboscis sacs are one-third the length of the head and neck, whilst the bothridia are two-ninths the length. 

 The spmes on the proboscides are of several kinds. Near one edge the spines have a wide base, and are 

 short and strongly reciu-ved. Over the rest of the proboscis the spmes are much more slender. The 

 length of the head and neck is 3 mm. The breadth of the head is 1 mm. Segmentation begins imme- 

 diately behind the proboscis bulbs, which latter are much broader than the first proglottides. The first 

 segments are much broader than long. The tenth segment is square. The last segment measures 3 mm. 

 long and '75 ram. broad. The genital pores are lateral and irregularly alternate. 



The entire worm measures 19 mm. long. 



Habitat. — The spiral valve of Pristis cuspidatus. Nine specimens. February 19, 1911. 



This species differs from Otobothrium crenecolle, Linton, and Oiobothrium insigne, Linton, in the 

 disposition of the bothridia, in their relative proportions to the length of the head, in the shape and 

 disposition of tlie spines, and in the general proportions of the head and neck. 



I have been unable to obtain a description of the only other known species of this genus, viz., 

 Otobothrium dvpsacicm, Lmton, and it may be fomid later that my specimens are identical with Otoboth- 

 rium dipsacum. They are referred to a new species only provisionally, and I have pleasure in naming 

 them in honour of Dr. von Linstow. 



Bhynchobothrimn, sp. T. (Plate II., Figs. 25, 26, 27, and 28.) 



Large numbers of cysts of an unknown species of Bhynchobothrium were obtained from the mesen- 

 teries of Ohorenermis lysan and C'ljbium guttatum. The cysts measured 11 by 3 mm., and were milky-white 

 in appearance. The larvse measui'ed 7 mm. by -6 mm. The bothridia are two in number and are 

 concave. Each bothridium aj)X)ears to be divided by a faint longitudinal septum into two Ixalves. At the 

 posterior end each bothridium is indented. The bothridia and proboscis sacs are almost equal to half the 

 entire length of the head and neck. The proboscides are coiled. The hooks are all similar, and are long 

 and slender, and bent suddenly almost at right angles at their extremity. 



Habitat. — (i.) The mesenteries oi Chorenemus lysan. Eighty-six specimens. February 27, 1911. 



(ii.) The mesenteries of Cybium guttatum. Nine specimens. February 25, 1911. 



Rhynchobothrium, sp. II. (Plate II. , Figs. 29 and 30.) 



Large numbers of cysts containing larvae of a second species of Rhynchobothrium were obtaijied 

 from the mesenteries of various lishes caught during 1908 to 1911. The cysts when preserved are often 

 globular, and measure 15 mm. in diameter. The outer part of the cyst is sometimes gelatinous in nature, 

 and is usually absent. Inside the gelatuaous covering is the cyst proper, which measures 5 mm. by 3 mm., 

 and is either of a milky-white or golden-yellow coloiu-. 



The larva itself lies bent in two inside this cyst. It measures 5 mm. long and l"o mm. broad 

 posteriorly. Tlie posterior part is 3-5 times the breadth across tlio botliridia, and tlie sacs measure 

 almost half the length of tlie head and neck. The proboscides are coiled, and are not protruded to the 

 exterior, their external openings bemg closed. The spines are of various sizes and shapes, and do not 

 appear to have any definite arrangement. There are two very small, undivided, saucer-like bothridia, 

 havuig a diameter of barely ■ 5 mm. There are no strobila. 



Habitat. — (i.) Walls of the air bladder of Lutjanus argeniimaculatus. Twelve specimens. 

 November, 1908. 



(ii.) The mesenteries of Drejmne punctata. Nine specimens. Februaiy 28, 1911. 

 (iii.) Tlie mesenteries of Diagramma, sp. Twenty specimens. November, 1910. 

 (iv.) The mesenteries of Serranus undulosus. Over one hundred specimens. November, 1910. 



