ON RECENT POLYZOA. 575 
Mucronelle described in his various papers, especially so in describing the 
species in Captain Warren’s collection from Bass’s Straits, and Dr. Daw- 
son’s from the neighbourhood of Queen Charlotte Islands. 
Genus 71. Aspidostoma, Hincks. 
‘Zoarium dimorphous, uni- or bi-laminar; erect, solid, rising from a 
contracted calcareous base, or expanded and foliaceous. YZocecia with the 
front depressed in the centre and the sides tumid. Mouth quite at the 
_ summit of the depressed area, concealed under the tumid border, ou 
which above the mouth is a penthouse-like, usually bifid, projection. The 
_ mouth arched above, straight below, and protected in front by a broad 
shield-like plate or mucro which is continued downwards for some dis- 
1. Aspidostoma giganteum, Blainv., ‘Chal. Rep.’ pl. xxxiii. fig. 3 
=Kschara gigantea, Blainw., ‘ Brit. Mus. Cat.’ p. 91 
= Aspidostoma crassum, Hincks, ‘ Ann. Mag. Nat. 
Hist.’ Feb. 1881. 
2. 3 erassum, Hincks, ‘ Annals,’ Feb. 1881, p. 160, pl. x. 
figs. 6, 6a. Loc.: Patagonia and the Falkland 
Islands. 
§ 2. Primary mouth notched or sinuated below. 
Genus 72. Schizoporella, Hincks, ‘ Brit. Mar. Polyzoa.’ 
‘Zoarium erect and bi- or uni-laminar, or crustaceous and unattached, 
oradnate. Lower lip with a median notch. Operculum pedunculate or 
contracted below.’—Chal. Rep. p. 162. 
: a. Bilaminar (escharan). 
1. Schizoporella furcata, Blainv., ‘Chal. Rep.’ pl. xxi. fig. 5. 
B. Unilaminar (hemischaran). 
2. Schizoporella nivea, Busk, ‘Chal. Rep.’ pl. xvii. fig. 1. 
3. a longispinata, Busk, ‘ Chal. Rep.’ pl. xvii. fig. 2. 
A, a auriculata (?), Hassall. 
Var. alba, Busk, ‘Chal. Rep.’ pl. xix. fig. 1. 
5 - Jacksoniensis, Busk, ‘Chal. Rep.’ pl. xix. fig. 3. 
6 a tenuis, Busk, ‘Chal. Rep.’ pl. xx. fig. 10. 
y. Adnate (lepralian). 
. Schizoporella elegans, D’Orb. = (?) Escharina id., ‘ Voy. en Amér. 
Mérid.’ 
(?) Lepralia squamoidea, Reuss & Manzoni, ‘ Castro- 
caro.” 
= marsupifera, Busk, ‘Chal. Rep.’ pl. xxii. fig. 14. 
9. 5 Cecillii, Aud. (sp.), ‘Chal. Rep.’ p. 166; and 
Hincks, ‘ Brit. Mar. Polyzoa,’ p. 262. 
+3 circinata, Macgil. = Lepralia, id., Macgil., ‘Nat. Hist. 
Vict.’ and ‘ Chal. Rep.’ p. 166, woodcut. 
ile 4 triangula, Hincks, ‘Annals,’ 1881; ‘Chal. Rep.’ 
p. 167. 
In addition to the above list of forms described by Mr. Busk from the 
“Challenger ’ collection, no fewer than fifty-two species and varieties have 
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