ZOOLOGY OF FERNANDO NOEONHA. 559 



also to hare more numerous ridges. The thorax is not much 

 broader than the abdomen, and the margin does not extend much 

 beyond the feefc. 



Machilis, sp. 



A single specimen of a very small brown Machilis was taken 

 under a stone at the base of the Peak; but, by an accident, the 

 specimen was destroyed, and we met with no others. 



Seira musarum, n. sp. 



Minuta, gregaria, in vita metallica, 1 mni.longa. Caput rotun- 

 datixm, hispidum ; oculi in maculis nigris fascia obscura ssepe 

 connectente. Antennse breviuscula?, violaceae, hispidae ; articulo 

 basali brevissimo, secundo et tertio subaequali basali duplo longi- 

 oribus ; articulo quarto triunciali, longissimo. Collum distinc- 

 tum. Segmentum secundum corporis (prothorax) latum, mar- 

 ginibus rotundatum ; tertium brevius, quartum multo brevius, 

 quintum longius, sextum quiuto subaequale, septimum sexto triplo 

 longius, termiualia brevia. Corpus in speciem fcrmc glabrum, 

 insquamosum, flavescens, segmentorum basibus et marginibus 

 cseruleo-purpureis. Pedes hispidi, primi breviusculi, secundi 

 longiores, tertii longissiini, graciles. 



Very abundant between the wet bases of the petioles of the 

 bananas, at the base of the Peak. 



It is very nearly allied to >S'. BiisJcii, Lubb., which was de- 

 acribed from specimens found in a hot-house in England, and pro- 

 bably introduced with tropical plants. It differs in the absence 

 of hairs round the neck and on the body, longer hind legs, and 

 also in coloration. The spring resembles that of S. Buslcii, and 

 is rather hispid. The neck is very distinct. These small Col- 

 lembola have been much neglected by collectors, and it is most 

 probable that this species was introduced in the bananas. 



ECHINODERMATA* 



There W( re not many species of Echinoderms found on the 

 island, but the following were obtained: — 



ClDARIS TETBULOIDES, Lamk. 



Very plentiful on the north side of the island in coral-reef 

 pools, near Sambaquichaba and Morro do Chapeo. 



* The species were determined for me by Prof. Jeffrey Bell. 



