66 MARINE POLYZOA. 



kind, as will be apparent in fig. 1. PI. LXXXI. There is often a 

 prominent process beneath the mouth and projecting over it, as 

 shown in fig. 5, which represents the form I believe described by 

 Dr. Hassall under the name of L. assimilis. Another peculiarity 

 of this species is the extraordinary difference of dimensions ex- 

 hibited in the cells of different specimens. The cells in Plate 

 LXXXI. are all drawn to the same scale. 



** Avicularium inferior, or below the mouth. 



2. LEPRALIA LANDSBOROVII. PI. LXXXVI. fig. 1. 



Cells ovate, coalescent, separated by raised lines ; surface gra- 

 nular ; mouth raised, circular, with a large and wide spout-like 

 sinus below, within which is an avicularium ? 



Lepralia Landsborovii, Johnst. Hist. Brit. Zooph. ed. 2. p. 310. 



t. 54. fig. 9 ; Gray, List Brit. Had. p. 119. 

 Hob. Coast of Ayrshire, Landsborough. On Pecten opercularis. 



The only specimen I have seen, or of which I can hear, is the 

 one in the British Museum Collection. This gives the idea of 

 an old or imperfect condition, and consequently the characters 

 above assigned, and perhaps the species itself, may be regarded 

 as only provisionally retained. 



3. LEPRALIA GALEATA, n. s. PL XCIV. figs. 1, 2. 



Cells ovato-ventricose, punctured all over ; mouth orbicular, 

 entire, unarmed ; an avicularium immediately below the mouth ; 

 mandible oval. Ovicell globose, punctured. 



Hab. Falkland Islands, T. del Fuego, Darwin. On fucus and 

 shell. 



4. LEPRALIA RETICULATA. PI. XC. fig. 1. PI. XCIII. 



figs. 1, 2. PI. GIL fig. 1. 



Cells ovate-elongated ; interspaces punctured ; mouth raised, 

 with a thin margin and a channelled sinus in the lower lip, two 

 to three spines on the upper margin ; a central avicularium im- 

 mediately below the mouth ; mandible acute. Ovicell globular, 

 punctured, its opening bounded below by the meeting of its sides 

 above the avicularium. 



Lepralia reticulata, J. Macgillivray , Ann. fy Mag. Nat. Hist. ix. 

 467 ; Johnst. Hist. Brit. Zooph. ed. 2. p. 317. t. 55. fig. 10 ; 

 Gray, List Brit. Rad. p. 120. 



