382 On InhaUtants of the Gill-cJiamhers of Land-crabs. 



xi./xii. The ova, when liberated, are provided with a large 

 supply of yolk. The oviducts have not been made out with 

 certainty, "but it is probable that they are, as usual, simply 

 outpnshiiigs of the septum xii./xiii- to meet the body-wall. 



The spermathecae open on either side at the septum iv./v., 

 and run backwards for a short distance as narrow tubes. 

 Between the tirst and second septal g-lands each expands into 

 a larger chamber with folded walls, and from this a duct runs 

 inwards at right angles to open into the oesophagus. The 

 openings are lined with long cilia projecting into the lumen 

 o£ the gut. The narrower distal portions o£ the sperma- 

 thecal ducts are covered externally with five longitudinal 

 rows of oland-cells. 



Lateral view of the anterior end of Enchytrceus parasiticus. Some of 

 the iuternal organs are represented as seen by transparency. 



Br., brain ; CI., clitellum ; I., intestine ; M., mouth ; M.Ph., muscular 

 pad of pharynx ; iV.C, nerve-cord ; Oy., ova ; <S.i, 'S.2, "S'.s, the three 

 pairs of septal glands ; Sp., aperture of spermatheca ; Sp.S., sperm- 

 sac ; c? , spermiducal pore. 



Enchytra^us parasiticus, sp. n. 



Diagnosis : — Length 8—9 mm. Number of segments about 

 70—80. Choitce 2 per bundle. Srain nearly straight behind. 

 Spermathecoi narrow distally, with 5 rotas of g/and-cells ex- 

 tern ally ; expanding into a pouch with folded walls before 

 opening by a wide ciliated aperture into the oesophagus. 



Hab. Interior o£ the gill-cliambers of a land-crab, Gecar- 

 cinus quadratus, Saussure [?=(t. ruricola, L."^J. Clarion 

 Island (Pacific Ocean). 



* Concerning the nomenclature of the host, Dr. W. T. Ualman kindly 

 submits the following note : — 



" The specimens from Clarion Island are labelled Gecarcinus quadratus, 

 Saussure, and I do not venture to dispute the identification, although I 

 am unable to form any clear conception of the distinguishing characters 



