45 



margin. The spindle-shaped foot ends in a tapering, finely pointed, claw, and is the 

 really characteristic point in the animal's shape. Its " triangular " teeth are, I fear, due 

 to imperfect observation. No further details are given. 



Length, -^ inch. Habitat. Freshwater, Quito (Schmarda). 



M. MACROGNATHA and M. OOPHTHALMA, Schmarda (135). See note 1, Sup 1 , p. 8. 



COLUEUS DUMNONIUS, Gosse (169), (PL XXXI. fig. 44). 



[SP. CH. Lorica in dorsal aspect a very broad oval, produced behind into two rather 

 short points, separated by a wide but shallow sinus ; the ventral line deepens in the 

 middle ; the ventral cleft extends around the front to tJie occiput ; foot robust, with two 

 moderately stout, separable toes. 



Three examples I have seen at different times among fine conferva, much studded 

 with Liemophoreat, from tide-pools at Paignton, near Torquay. One of these had the 

 sides much more parallel than the other. A large pale red eye is conspicuous. All had 

 the habit of pivoting on the toe-tips, jerking and posturing. 



Length, ^ inch. Habitat. Marine ; Paigntou. P.H.G.] 



COLUKUS DICENTBUS, Gosse (169), (PI. XXXI. fig. 42). 



[SP. CH. Lorica ovato-fusiform ; body ending behind in a minute tail of two hooks 

 adnate at their base; foot stout; toes long, very slender, more or less decurved 

 throughout. 



1 have examined nearly a score of individuals, and am satisfied that this is a true 

 species, in which the peculiar termination of the body (shown enlarged in fig. b) is 

 constant, thus differing from C. aniblytelus and C. grallator. The tail-points resemble 

 rose-prickles. The appressed toes seem a single slender spine, but are often thrown 

 apart. Two red eyes are distinct. It is not rare in the Tay tide-pools. 



Length, ^ inch. Habitat. Tay tide-pools. P.H.G.] 



COLUBUS GRALLATOB, Gosse (169), (PI. XXXI. fig. 43). 



[SP. CH. Lorica much compressed; lateral outline ovate, sub-square behind, 

 without points ; toes half as long as lorica, very slender, straight, readily separated ; 

 ventral cleft slightly narrowed in tlie middle. 



Nearly related to the preceding ; but the outline, viewed dorsally, is longer and 

 narrower ; there is no protrusion of the body behind the lorica ; and the toes are quite 

 straight. The frontal hook is unusually narrow. I have not been sure of an eye. A 

 dozen examples have occurred from the Tay tide-pools. 



Length, ^ inch. Habitat. Tay tide-pools. P.H.G.] 



COLUBUS MICBOMELA, Gosse (PI. XXXI. fig. 45). 

 Monura micromcla ...... Gosse (169). 



[SP. CH. Lorica in dorsal aspect broadly ovate, produced behind \nto slightly 

 projecting points, separated by a shallow rounded sinus ; in lateral aspect the quadrant 

 of an oval; foot small ; toes of uniform excessive tenuity. 



I have had, for thirty-six years, drawings of a species which I had marked (with 

 " '?") as Monura dulcis. Very recently, in water from Slough, what seems the same 

 form, now figured, has occurred, and that repeatedly. The excessive tenuity of the toes 1 

 is the most striking feature ; and then the round sinus between the lorica-points. No 

 eye is visible. The general figure is that of Col. bicuspidatus. 



Length, ^ inch. Habitat. Lacustrine. P.H.G.] 



1 In page 3(7 of the Joiirn. Roy. Micr. Soc., 1887, Mr. Gosse says "I have seen the toes widely ex- 

 panded. The species must therefore be transferred to Colurus." 1 



