A HISTORY OF SUSSEX 



55. Schizotheca fissa, Busk. 



Zooecia ovate, small, short ; aperture 

 elevated, with six spines and a narrow 

 sinus in the lower lip ; ocecium sub-cres- 

 centic or with a wedge-shaped fissure in 

 the middle. Upon an old scallop shell 

 from deep water ; rare. Hastings. 



56. Hippothoa dmaricata^ Lamouroux. 

 Colonies composed of oval zocecia arranged 



in single sequence and connected together 

 by tubular prolongations. Lateral branches 

 are given off at an open angle and unite 

 with others ; the aperture is circular but 

 with a narrow sinus below ; beneath the 

 aperture runs a thickened, longitudinal, 

 median ridge. Common upon shells and 

 stones from moderately deep water. Hast- 

 ings. 



57. Hippothoa flagellum, Manzoni. 

 Similar in habit to the last species, but 



the zooecia are farther apart, the interval 

 being usually equal in length to two zooe- 

 cia, whereas in divaricata it is usually equal 

 to the length of one. The aperture is 

 egg-shaped, and there is no median ridge. 

 Common. Hastings. 



58- Rhyncopora bi-spinosa, Johnston. 



A species encrusting old shells, and one 

 subject to several modifications in the region 

 of the aperture, the margin of which is 

 sometimes produced into two lateral and 

 vertical processes ; at others, one of these 

 may be bent across the aperture, or may 

 become central. A fairly constant feature 

 is a more or less spinous mucro rising from 

 beneath the aperture. There is often too 

 a large avicularium mounted upon a broad 

 pedestal, taking the place of this mucro, 

 and generally placed rather laterally. One 

 specimen obtained is found enveloping a 

 colony of the hydroid Hydraciinia ecbinata, 

 itself encrusting the shell of a Nassa. The 

 ocecia upon this specimen are particularly 

 plentiful. Trawled ; rather rare. Hast- 

 ings. 



ESCHARID.S: 



59. Lepralia pollasiana, Moll. 



A hardy looking species encrusting rocks 

 at low tide. Aperture large, more deeply 

 arched than a semicircle ; front wall pit- 

 ted. Common. Hastings. 



60. Lepralia foliacea, Ellis and Solander. 

 This species forms large masses of foli- 

 ated and anastomosing laminae, the zooecia 

 being disposed on both sides of the laminae. 



The zocecia are ovate, and have large pores 

 over the front wall. Aperture horse-shoe- 

 shaped, with sometimes a slight prominence 

 beneath. Habitat, rather deep water. 

 Somewhat scarce. Hastings. 



6 1. Lepralia pertusa, Esper. 

 Encrusting old shells. Zocecia oval, 



with a circular aperture, of which the 

 lower margin is slightly disjunct ; beneath 

 is a process, tri-radiate in form ; wall of 

 zooscium poriferous. It may be noted that 

 young zooecia of Smittia cheilostoma before 

 the development of the sinus closely re- 

 semble the zocecia of this species. From 

 moderately deep water; rather rare. Hast- 

 ings. 



62. Lepralia adpressa, Busk. 



Colonies encrusting small shells, e.g. 

 whelk, Natica, Trochus. The zocecia are 

 ovate, pitted, and have a boss at either or 

 both corners of the aperture. The latter 

 is horseshoe shaped, the sides being slightly 

 indented ; from moderately deep water ; 

 somewhat rare. Hastings. 



63. Lepralia nitidula, Hincks, MS. 

 Hastings. 



64. Porella concinna, Busk. 



A species encrusting shells and stones 

 and showing much variation. The zocecia 

 are coffin-shaped, or various in form, and 

 has an opalescent lustre. The margin is 

 often deeply sinuous, almost dove-tailed, 

 and is perforated along the border. Aper- 

 ture horseshoe shaped, with two spines in 

 marginal zooecia and a prominence below. 

 Very common. From moderate to deep 

 water. Hastings. 



65. Smittia ianasborovii, Johnston. 

 Zocecia crystalline, oblong or coffin- 

 shaped, with perforations in the front wall. 

 Aperture nearly round and raised into a 

 collar, with a small avicularium upon the 

 lower lip. Not uncommon upon rock 

 from deep water. Hastings. 



66. Smittia reticulata, McGillivray. 



In this species there is a deep sinus in 

 the lower lip, and instead of an avicularium 

 there, as in the last species, there is a larger 

 one below, pointing downwards and look- 

 ing like a pendant from a neck. Above 

 the aperture there are either two or three 

 spines, and the margin of the zocecia is 

 bordered with pits or vacancies. Hincks 

 remarks upon an instance where two zoce- 

 cia side by side have a single wide ocecium 



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