Gatty Murine Lahoratury, St. Andrews. 167 



foot. The wings are short and broad, expanded and smoothly- 

 rounded at the free end. The shaft has a forward curve 

 distally, then it bends backward below the wings, and 

 slightly diminishes at the throat, from which a short sharp 

 main fang passes ofl' at little more than a right angle, and. 

 with a single prominent spike on the crown, Po>teriorly 

 the dorsal bristles greatly increase in length and slenderness, 

 stretching upward and outward as a hair-like tuft, whilst the 

 superior lamella is represented by a small conical papilla 

 above their base. The hooks occupy the same relative 

 ])Osition, but the number is greater, viz. about 7, and a 

 slight rim indicates the ventral lamella. 



Another form very common amongst sand near low-water 

 mark at St. Andrews is Spiophanes bomby.v, Claparede "^. 

 In this the head has two short frontal tentacles, from which 

 a median elevation passes backward to end in a small conical 

 peak or eminence. The two palpi are of moderate size, 

 contain blood-vessels, and are frequently coiled. A small 

 eye-speck occurs posteriorly on each side of the median ridge 

 near the peak, and in the preparations are raised, with the 

 ridge, above the general level. An anterior pair, a little 

 wider apart, lies in front of them. The body is about 3 inches 

 in length, very little tapered anteriorly, and much more so 

 posteriorly, where it ends in a Avide vent with crenate lips 

 and two short ventral cirri. Many specimens have repro- 

 duced tails, for the species is remarkable for its fragility. 

 The dorsum is somewhat flattened anteriorly, rounded 

 throughout the rest of its extent, and marked ventrally by a 

 median band, which, when it comes to the vent, splits, a limb 

 curving upward on each side to join the dorsal band, and 

 it may be indicating the junction of the ventral with the 

 dorsal vessel. A median and two lateral brownish lines 

 occur on the dorsum behind the head, but they pass only a 

 short distance backward. The sides are vascular anteriorly, 

 then of a pale brownish hue, thereafter orange from the 

 colour of the gut. The ventral surface is pale, though the 

 gut is visible. 



The 1st foot has dorsally a subulate or narrow lanceolate 

 lamella (cirrus) which has been shifted inward, so that it 

 resembles a branchia. The dorsal bristles are very long and 

 slender, with hair-like tips and with no evident wings. They 

 spring from a conical setigerous process, also carried inward 

 on the dorsum. The ventral bristles of this foot are shorter 



* M6m. Soc. Pbys. et Ilist. Nat. Geneve, xx. p. 48-5, pi. xii. fig. 2. 



