186 DR. HINDE AND ME. HOLMES OK SPOKGE-REMAINS 



projecting directly outwards ; near the ends tlie spines are 

 smaller and oblique in direction. Length -21 mm., thickness 

 (including spines) "04 mm. 



Pi. YII. fig. 27. Subcylindrical spicule, irregularly curved, 

 ends obtusely rounded; surface with small spines irregularly 

 distributed but more numerous near the ends. Length "17 mm., 

 thickness '024 mm. Eare. 



PI. YII. fig. 28. Spicule subcylindrical, bent so that the rays 

 form a slight angle at the centre, ends blunted and spined. 

 Surface verticillately spined ; the spines short, conical, projecting 

 directly outwards. Axial canal with a distinct central bend, 

 closed at both ends of the spicule. Length "21 mm., thickness 

 •022 mm. 



PI. YII. fig. 29. Subcylindrical spicule, slightly curved and 

 somewhat thicker in the central portion, ends evenly rounded 

 and spined, surface verticillately spined; the verticils closernear 

 the ends, spines minute. Length "23 mm., thickness '015 mm, 



PI. YII. fig. 30. Cylindrical, slightly curved spicules with 

 evenly rounded ends ; spines short, blunted, disposed in verticils 

 at about equal distances apart ; ends thickly spined. Length 

 •135 mm., thickness '013 mm. Mr. Carter has figured a similar 

 spicule from an unknown sponge from the Grulf of Manaar (Ann. 

 & Mag. N. H. s. 5, vol. vi. 1880, pi. v. fig. 29). 



PI. YIL fig. 40. Cylindrical, evenly curved, ends evenly 

 rounded and very thickly spined ; spines irregularly distributed. 

 Length '085 mm., thickness "012 mm. 



PL YII. fig. 38. Spicule subcylindrical, slightly inflated in 

 the centre, ends obtusely rounded; surface with spiral ridges or 

 crests of minute tubercles or spines, the ends likewise spined. 

 Length -16 mm., thickness '02 mm. Similar spicules have been 

 figured by Mr. Carter in Dotona pidcliella, from the Gulf of 

 Manaar (Ann. & Mag. N. H. s. 5, vol. vi. p. 57, pi. v. fig. 24). 



Dumb-bell Skeletal Spicules of Piocajaia, Osc. Schmidt. 

 PI. YII. fig. 37. Cylindrical, slightly curved, with inflated 

 ends. The shaft is quite smooth, wliilst the ends are very 

 minutely spined or tuberculate. Length -095 mm., thickness 

 •015 mm. This spicule resembles those in Plocamia {I)ictyo- 

 cylindrus) manaarensis, Carter, sp. (Ann. & Mag. IST. H. s. 5, 

 vol. vi. 1880, p. 37, pi. iv. fig. 1 c), but it is not more than half 

 the length. See also Eidley (Journ. Linn. Soc, Zool. vol. xv. 

 1881, p. 482). 



