770 anticoma: a genus op free-living marine nematodes, 



of cells. In the illustration the development of the spermatozoa is 

 shown by means of the three small figures placed to the left of 

 the anterior testicle, each phase of the development 

 being placed opposite the jiortion of the testicle in 

 which it occurs. The first definite arrangement 

 noticeable in the protoplasm of the blind end of 

 the testicle is a grouping together into spherical 

 masses of certain minute bodies whose number and 

 position are discoverable only through their nuclei. 

 In this stage there seems to be no cell wall. In 

 the second stage each of these agglomerations 

 appears surrounded by a cell wall. Each nucleus 

 now becomes elongated, and all arrange themselves 

 in a radial direction, after which the single multi- 

 nucleated cell splits up into somewhat pyriform 

 spermatozoa, each possessed of one elongated 

 nucleus. One of these latter is represented in 

 the largest of the three small figures. Illustrations 

 of the histological details of the vas deferens and 

 ductus ejaculatorius are placed opposite those 

 organs in Fig. 2. 



Habitat. — Both sexes of this species were found 

 to be common among algse on the coasts of the 



t^ 



Fig. 2. Anticoma 

 typica. 



6 Sexual apparatus. 



Island of Ceylon in the winter. 



2. A. Merthi, Bast. '\ ',1 Ts oti T 6-35 mm. The slightly convex- 

 conoid neck is surmounted by an expanded lip-region. There are 

 at least six cephalic setfe. Five i)ectoral hairs occur on either 

 lateral line just behind the pharyngeal region. The junction of 

 the conoid oesophagus with the tessellated intestine is marked by 

 a shallow but distinct cardiac collum. The rectum is only one- 

 half as loDg as the anal diameter. The excretory pore is situated 

 3-67 of the length of the animal from the anterior extremity. 

 The tail is concave-conoid to the slightly swollen ellipsoidal 

 terminus, which is about one-fourth as great in diameter as the 

 base of the tail. Bastian observed two anal glands. 



