232 ANATOMY AND PHYSIOLOGY 



Fig. 



36. Ovo-spiNULATE. — The basal inflation being oviform, 

 the smallest portion being at the extreme basal 

 point. From Tethea spinwlaria, Bowerbank. X 

 308 linear. 



26. Enormi-spinulate.— Having the spherical inflation 



sUghtly within the basal portion of the shaft of 

 the spiculum. Hymeniacidon celata, Bowerbank. 

 X 260 Unear. 

 — . BispiNULATE, — See No. 228, and Plate X, same 

 number. 



— . Trispinclate. — See No. 229, and Plate X, same 

 number. 



27. Ensiform. — Expanding towards the apex, but ter- 



minating acutely ; so that the outline has more or 

 less the form of the blade of a sword. Sponge 

 untriown. X 130 linear. 



28. Entirely spined. — When the spines are equally 



dispersed over the spiculum from the base to the 

 apex. Halichondria incrustans, Johnston. X 

 260, linear, Pages 38, 40. 



29. Basally spineD. — When the spines do not occupy 



more than about one-third of the length at the 

 basal portion of the spiculum. Hcdichondria In- 

 galli, Bowerbank. X 260 linear. 

 SO. Medially spined.— When the spines occupy only 

 about one-third of the length at the middle of the 

 spiculum. Halichondria IngalU, Bowerbank. X 

 260 linear, Page 38. 



31. Apically spined.t— When the spines occur only at 



and near the apex of the spioiilum : from an unde- 

 scribed sponge, locaUty unknown. X 160 linear. 



32. Terminally spined. — .When the spines occur near 



both the bfise and apex of the shaft of the spiculum 

 but not at the middle : from an undescribed species 

 of sponge, locality unknown. X 160 linear, Page 

 38. 



