FORMS OF THE SPERMATOZOA. 145 



Claparede observed cellseform spermatozoa, i.e., spheroidal cor- 

 puscles, with small rod-like nuclei. 



MYRIAPODA. The spermatic elements of the Myriapods 

 present two distinct types. Those of the Chilognatha are fusi- 

 form, conical or cocked-hat-shaped rigid bodies, as in Glomeris 

 and lulus (Leuckart), whilst those of the Chilopoda possess 

 long threads which exhibit movements (Lithobius, Geophilus, 

 Stein). 



INSECTA. The spermatozoa of Insects are invariably capilli- 

 form threads pointed at both extremities. Their movement 

 is sinuous or wavy, one end is often rigid, and in diluted fluid 

 the zooid often revolve, forming a series of circles. One form 

 alone differing from this simple one has been described by v. 

 Siebold, in Locusta and Decticus. These grasshoppers possess 

 an angular appendage adherent to one end of the elongated 

 body of the zooid. 



Fig. 176. 



Fig. 176. Spermatozoa of Blaps mortisago. 



MOLLUSCA. The seminal elements of BRYOZOA have usually 

 the form of a pin, with a more or less flattened head : Alcyo- 

 nella (v. Beneden, Dumortier). In Flustra carnosa they 

 are linear, and slightly sinuous; in Alcyonidium gelatinosum 

 they exhibit a pointed body, with a flat and a bulging side, 

 and with an attached fibre which is thickest in the middle 

 (Kolliker). 



In the SALPID^E the hair-like form reappears, whilst in the 

 ASCIDIA the head is cylindrical, pyriform, or elliptical, and the 

 body capilliform (Kolliker). In the LAMELLIBRANCHIATA, cylin- 



