326 MANUAL OF NATURAL HISTORY. 



themselves, or worm-looking Sipunculidce, some- 

 times, Cuckoo-like, occupying habitations not of 

 their own construction. The collector may very 

 possibly be foiled in his most determined attempts 

 to preserve intact some obstinately-fragile Luidia, 

 which not only refuses to be captured entire, but, 

 according to Forbes, adds insult to disappointment, 

 by vexatiously winking at its baffled tormentor. 

 In deeper water in northern seas a stray Gorgon V 

 Head (Astrophytori), with its strangely twisted arms, 

 may remind its captor of Medusa, with her tangled 

 locks; a rare Cake-Urchin (Echinarachnius) may 

 enrich his collection; or, if off the Zetland Islands, 

 a fine, showy " Piper" (Cidaris), with its long, 

 cylindrical spines, like the drones of a bag-pipe, 

 may amply reward a day of toil. In tropical 

 seas specimens of pedunculated Pinnigrada (Pen- 

 tacrini) should be diligently sought for, and, if ob- 

 tained, will prove valuable acquisitions, both from 

 their great rarity, and from the knowledge afforded 

 by their structure of extinct, allied genera. Much 

 may be done in collecting members of this class in 

 eastern and southern regions, as China, Japan, and 

 Australasia, many also inhabit the shores of the 

 great Pacific Ocean, the seas around the Cape of 

 Good Hope, the Red Sea, and the Mediterranean. 

 The stomachs of fish, especially of such as are in 

 the habit of preying upon these animals, should, 

 when practicable, be carefully examined, as not only 

 have rare examples been frequently so obtained, but 

 by the same means new species have at times 



