386 p. HERBERT CARPENTER. 



been obtained at the same localities as Anted ons which have 

 abundant sacculi. 



ThaSj for example, these red spots or sacculi are largely 

 developed in Antedon abyssorum, A. reraota, and in Pro- 

 machocrinus abyssorum, all from a depth of 1600 fathoms 

 in the Southern Ocean ; but I have not seen one on tlie arms or 

 pinnules of Hyocrin us bethellianus from the same locality ; 

 while if they exist at all in Bathycrinus aldrichianus, of 

 the same dredging, they are so scantily developed as to be 

 almost unrecognisable. Here are some similar facts of the 

 same kind. The ''Challenger'^ dredged eleven species of 

 Antedon at a station near the Ki Islands, some with abundant 

 sacculi, others in which they are almost entirely undeveloped ; 

 while there is no sign of them at all in four species of Meta- 

 crinus and in one of Actinometra from the same dredging, 

 neither do they appear in two species of Pentacrinus or in 

 four of Metacrinus from off the Meangis Islands, though 

 abundant in six Antedon species from the same locality. 

 The " Challenger's '^ dredgings at Cape York yielded nine 

 species of Actinometra, in which there is no sign of sacculi; 

 but they are enormously abundant on the pinnules of Antedon 

 microdiscus and A. multiradiata, fairly so in A. irregu- 

 laris, and scanty in A. bid en tat a — all from the same locality. 

 They are very thick at the sides of the pinnule ambulacra in 

 A. Dubeni and A. carinata, of which latter species over 100 

 individuals were obtained at Bahia; but there is no trace of 

 them in Actinometra lineata or Act. raeridionalis, 

 several examples of which were found living at the same place. 

 I could name many similar cases from the dredgings of the 

 " Blake" in the Caribbean Sea. There are six different stations 

 (near Barbadoes, Montserrat, Martinique, and St. Vincent) 

 where Antedon species occur with abundant sacculi at the 

 sides of the ambulacra, while none are to be found in the species 

 of Actinometra and Pentacrinus which were obtained in 

 the same dredgings. 



Antedon tenuis, dredged by the "Challenger'^ at Station 

 170, has numerous sacculi on the outer pinnules, just as in the 



